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View Full Version : How To: Install an Autometer Boost Guage


LinuxRacr
02-05-2004, 12:59 AM
I don't think I made this clear enough but....
Credit goes to Chris (MSP2746 ) for this informative How-To...in other words, he is the one to ask the questions to.


This how-to is intended to help people install a mechanical Autometer boost guage in a Mazdaspeed Protege, and assumes replacement of the nylon hose with real vaccum hose. If it doesn't work with your turbo MP3 or P5, please don't come to me and ask why, 'cause chances are I won't know :). The Autometer full pillar pods replace the factory pillar, so I highly reccomend getting them. That way, you won't have to drill holes in your factory plastic.

Parts needed:
- Ace Hardware: 1) Barb fitting with 3/16" barb on one end and 1/8" female pipe threads on the other (I checked every hardware store in my area, and Ace is the only one that had this). 2) Industrial Velcro. 3) Small black zip ties. 4) Teflon Tape.

- Auto Parts Store: 1) If using an A-pillar pod and splicing into the intake manifold hose, you'll need about 6' of 3/16" ID vaccum hose (You could get away with 5', but you won't have much flexibility as far as mounting locations go.) 2) A vaccum tee with three 3/16" barbs

- Radio Shack: 1) A 3-color (red/green/black) pack of small guage wire. 2) Wire Taps. 3) Ring Terminals. 4) Crimp Caps.

Install the stuff in any order you'd like, but here's what I did:

1) Pull the factory A-Pillar off by pulling it towards the passenger side of the car. Be careful not to apply undue force, as the plastic clips could break.
2) Take the U shaped section off the underside of the dash by pulling outward on the "ends" of the U. Next pull the side panel off of the dash using a tip from Dr Sound and Rocketspeed: "It just pries off with a screwdriver. I just started from the bottom and it popped off with a little effort." Thanks for that one guys!
3) Look for an easily accessable nut under the dash that threads onto a bolt in the body. Crimp a ring terminal onto the end of your black wire, slip it over the bolt, and crank the nut back on. Route your wire under the dash and up to the A-Pillar.

http://www.msprotege.com/members/MSP2746/ground.jpg

4) Reach behind the dash and push the tabs holding the dimmer switch in together (one on top, one on bottom), and push the switch out of the dash. Tap into the green wire w/ black stripe with a wire tap. I used green (go figure! :) ) wire for this. Run that wire under the dash and into the a-pillar. That won't dim your guages, but it will light them up with the parking lights. Previous attempts to dim the guages with the dash lights have resulted in failure, as the guages would get brighter as the dash lights got darker.

http://www.msprotege.com/members/MSP2746/dimmer.jpg

5) Find the grommet in the firewall that has your skinny yellow amp power cable coming through it. There should be plenty of room to the left of that in the grommet to run your vaccum hose. I just stabbed it repeatedly with an ex-acto knife, and the vaccum hose went right through. Stick the hose through the hole, and run the inside length to the a-pillar.

http://www.msprotege.com/members/MSP2746/hosethrough.jpg

6) Find the other end of the hose in your engine bay, and route it along the firewall to the intake manifold. There's a U-shaped vaccum hose on the top right hand side of the intake manifold. Snip that bad boy in half and shove the opposing ends of the tee fitting into the factory halves. Shove the boost guage hose over the 3rd end, and use some zip ties to make everything look nice and neat. If you're paranoid, you could use zip ties to make sure the hose won't slip off the barb connector.

http://www.msprotege.com/members/MSP2746/hosetee.jpg

7) Use crimp caps to hook your black wire (ground) to the black wire coming off of your light fixture. Hook your green wire (light 12v) up to the white wire coming off of your light fixture. Use Teflon Tape when threading your barb fitting onto the back of your Autometer guage.
IMPORTANT!
Make sure you run your vaccum hose through the hole in your pod before sliding it onto the barb fitting. Use another zip tie to hold the hose onto the barb if it'll make you feel warm and fuzzy. Stick your light bulb in the back of the guage at this point too.
8) Unpeel the backing off both sides of your velcro and stick it to the very left side of the metal brace that your factory A-pillar mounted to. Line the pillar up as best you can, and slap it in place. That industrial velcro holds like no other, so do your best to get it right the first time.
9) Again, that industrial velcro holds like no other, so do your best to line up and insert your guage into the pod straight the first time.

Hope this helps!

chkmgnt58
03-24-2004, 11:58 AM
so im installing an autometer boost gauge, and im doing fine right up until the point where i have to take off the dash. what exactly am i supposed to be pulling on? im terrified of doing the wrong thing and breaking my dash. any pictures or detailed descriptions would be appreciated.

kNOWfREED0m
07-08-2004, 10:22 PM
how does the 3/16 vaccum line connect to the gauge??

kNOWfREED0m
07-08-2004, 10:34 PM
bump i neeed to know because the way i installed it is giving me some trouble...

lynchy77
07-22-2004, 11:16 AM
where it says that use the "green" wire to connect to the white on the light fixture shouldnt it be red? cuz i thought the green went to the dimmer switch? plz correct me if i'm wrong cuz i'm gonna try to help a friend install his and we need all the help we can get

hazeXban
09-22-2004, 09:50 PM
Are you sure its a 1/8" end for the barb adapter? 1/8" is tiny and the thread on the back of my gauge is way bigger than that and my adapters thread is also way bigger than 1/8" so I am confused. I have the autometer gauge and all that came with it is the nylon hose, and the 2 sets of compression fittings. Please help

RenzoMSP
07-16-2005, 01:07 AM
Are you sure its a 1/8" end for the barb adapter? 1/8" is tiny and the thread on the back of my gauge is way bigger than that and my adapters thread is also way bigger than 1/8" so I am confused. I have the autometer gauge and all that came with it is the nylon hose, and the 2 sets of compression fittings. Please help
Can anyone post a pic how this looks. I dont want to use that nylon hose. THanks

livelyjay
08-04-2005, 09:28 AM
Just an FYI, I updated this in another thread as well. To get the gauge lights to work with the dimmer switch, hook the gauge up to POWER and DIMMER. The dimmer switch outputs 11-12v in the "dimmest" setting and 1-2v in the "brightest" setting. As we all know, electricity flows from high to low voltage, so hooking up the lights to 12v and dimmer will have the aftermarket gauges dim in the same fashion as the stock gauges.

zzMSP03.5
02-05-2006, 03:43 PM
So should my gauge be reading 10psi vaccum or 20 at idle?

jestermsp
06-20-2006, 10:06 PM
sub

LinuxRacr
06-21-2006, 12:25 PM
So should my gauge be reading 10psi vaccum or 20 at idle?

You should be around 20 inches of vaccum at idle.

SedanMan
01-22-2007, 09:11 PM
I took livelyjay's advice and it works great.

I have 23 vacuum at idle. Thanks for the how-to!

baconbitz
03-05-2007, 07:12 PM
Does anybody have a picture of how the line hooks up at the intake manifold?

azeli73
03-05-2007, 07:18 PM
It's the last one in the first post

http://www.msprotege.com/members/MSP2746/hosetee.jpg

baconbitz
03-05-2007, 07:21 PM
Strange. Mine looks like that but the line for my boost gauge is clear. I gotta take a better look at it tomorow I guess.

azeli73
03-05-2007, 07:44 PM
some replace the clear boost line with a rubber line. The clear ones tend to dry out and crack over time.

SedanMan
03-05-2007, 09:11 PM
They are more prone to kink as well. You're better off using some 3/16" hose.

baconbitz
03-05-2007, 09:36 PM
Ah I see. When I changed out intake mani's I noticed it stopped working. The light comes on at night but its not reading boost or anything so im going to try and see if I can fix it tomorow I guess.

baconbitz
03-06-2007, 02:16 PM
Alright I couldnt get it to work.

boostdprotegelx
03-06-2007, 02:34 PM
Ah I see. When I changed out intake mani's I noticed it stopped working. The light comes on at night but its not reading boost or anything so im going to try and see if I can fix it tomorow I guess.
ok man..do you have a manual or electric?

boostdprotegelx
03-06-2007, 02:37 PM
and just FYI guys, i have a great line to hook up the dimmer switch to, it would be the radio "switched power wire"...in the radio harness..works very well.

baconbitz
03-06-2007, 03:11 PM
ok man..do you have a manual or electric?
To be honest I dont have a clue. The guy that owned the car before me had it on. I noticed it had stopped reading boost after I switched intake mani's.

boostdprotegelx
03-07-2007, 07:25 AM
To be honest I dont have a clue. The guy that owned the car before me had it on. I noticed it had stopped reading boost after I switched intake mani's.
hmm...ok, well is there a hose going to the back of the guage??
does it read ANYTHING?

Deathspeed
03-12-2007, 11:17 PM
this is kinda off subject i installed my wbo2 and wired it to my radio ground and power and now my parking lights,dash lights dont work i also wire my boost guage to the dimmer switch any advice??

boostdprotegelx
03-13-2007, 08:03 AM
this is kinda off subject i installed my wbo2 and wired it to my radio ground and power and now my parking lights,dash lights dont work i also wire my boost guage to the dimmer switch any advice??
did you do the install w/out disconnecting the battery? you could have popped a fuse.

Deathspeed
03-13-2007, 05:36 PM
No i disconnected it but i think i found where my problem is and it has nothing to do with the wbo2 i was trying to find a wire behind my A/C panel and there is a short somewhere gonna fix it today but thanks for the help

Nuspd
08-03-2007, 05:30 PM
Hey thanks for the post, installation went swimmingly (cool)

MSP_03_FL
02-01-2008, 11:04 AM
Thanks for this How-To. It went perfect.(2thumbs)

scjap
02-12-2008, 10:17 AM
thanx a lot everything went fine.
im concerned that my vacuum is reading 15 in tho.
ive heard most people are at like 20ish.
anyone know why this would be the case?

mzdspd05
04-21-2008, 12:18 AM
...To get the gauge lights to work with the dimmer switch, hook the gauge up to POWER and DIMMER. The dimmer switch outputs 11-12v in the "dimmest" setting and 1-2v in the "brightest" setting. As we all know, electricity flows from high to low voltage, so hooking up the lights to 12v and dimmer will have the aftermarket gauges dim in the same fashion as the stock gauges.

I have a quick question about the wiring of the Autometer boost gauge:
So tap the gauge's white wire into the dimmer switch's green wire w/ black stripe? And then tap the gauge's red wire where? Should this red wire be hooked up to switched power, or constant power?

Thanks in advance!

boostdprotegelx
04-21-2008, 01:50 AM
I have a quick question about the wiring of the Autometer boost gauge:
So tap the gauge's white wire into the dimmer switch's green wire w/ black stripe? And then tap the gauge's red wire where? Should this red wire be hooked up to switched power, or constant power?

Thanks in advance!

my power wire is generally hooked to my switched power..only because i like to have the guage light up w/ my lights on.. that's it.

Flash5
06-20-2009, 09:28 PM
One year bump!

i read through this thread and am still a little confused over the power wiring (electrical stuff scares me!). so my gauge comes with white(power) and black (ground) wires. i want to use the dimmer switch but still do not get which wire i should tap into for each. the green one or the white one for power? and where should i ground it?

Laser Blue
08-24-2009, 12:45 AM
subbin

destineal
01-24-2010, 02:37 AM
Is there a better way to enable the dimmer function on the gauge or should another wire tap be used like this?
green to gauge and red from wire tap on green/black wire to wire tap on white line?

Gasological
01-25-2010, 02:37 PM
Is there a better way to enable the dimmer function on the gauge or should another wire tap be used like this?
green to gauge and red from wire tap on green/black wire to wire tap on white line?

I'm not sure I understand the diagram you've got and have yet to wire mine in. Could you explain a little more please?

destineal
01-26-2010, 06:00 AM
I'm not sure I understand the diagram you've got and have yet to wire mine in. Could you explain a little more please?

Green/black, black, and white represent the wires of the the dimmer. The red block is a wire tap and it has a green wire tapping into the green/black wire. that little green wire goes to the gauge and provides power. In addition, there is a red wire sharing the wiretap with the green wire. The red wire taps in to the white wire using a wire tap. I did not do this when I installed my gauge, but I was trying to see if I did that; would that allow the gauge to dim with the original gauge cluster.

ohdavy1
04-05-2010, 04:06 PM
where do i hook up the 12v power (red) cable?