1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

Autometer Tach Installation

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Old 09-12-02, 04:22 PM
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Autometer Tach Installation

My brother just got a Rx7 today I have an autometer tach for him its just that I dont know how to install it could you please help me out with this. I only know where the black wire goes, the red white and especially the green one I have no Idea. Please I tried to do a search and no luck with this. So if there is a website or if you know how please help me out thanks.
Old 09-12-02, 04:51 PM
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Connect it to the trailing ignitor. What's wrong with the stock tach anyway?
Old 09-12-02, 04:56 PM
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This is just a guess. But, I'd say one is 12V + (probably red), one is ground (black), one is the signal wire from the - side of the ignition coil and the last one is for the dash illumination.
Old 09-12-02, 05:03 PM
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Why dont you just do what Shadetree mechanics did and plug it into your new msd ignition system!

OH! You are part of the billion people who do not have MSD ignition system? TOO BAD!
Old 09-12-02, 05:13 PM
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Originally posted by REVHED
This is just a guess. But, I'd say one is 12V + (probably red), one is ground (black), one is the signal wire from the - side of the ignition coil and the last one is for the dash illumination.
No **** we barely got it today.lol


ooooppppppsss I quoted the wrong one what a dumb *** sorry dog.

Last edited by CivicSi; 09-12-02 at 05:17 PM.
Old 09-12-02, 05:15 PM
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where do you hook the 12V ones the red and white. Any good spots
Old 09-12-02, 06:16 PM
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Go to the Autometer web site and download the instructions. I'm pretty sure they'll help.

Good luck.
Old 09-13-02, 01:45 AM
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dont hook up the 12v (red one0 directly to the battery other wise it will be on 24/7
with the 12v take off ur fuse box and bridge it off somthing that comes on with the ignition eg the fule pump. but dont go bridging too many things off the fuse box.

the black one can just connect to any part of the metal car body, just screw it down with and screw alreayd in the car.

also there will be another wire called the illume wire, this is for the light on it, u will have to bridge this off the wire going to the lights somewere in ur instument panel or dash. but make sure it is on the positive line and not the negative other wise the light aqint working.
Old 09-13-02, 04:39 AM
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("You almost blew the top off that burger with that double shot of barbeque sauce you gave it, now me and the mad scientist have to rip apart the counter and replace the onion rings you fried")

Man I love that quote...lol
Old 09-13-02, 08:59 AM
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red - 12V ignition
black 12V negative ground
white - tach signal
green - illumination 12V
Old 09-13-02, 09:01 AM
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Originally posted by Directfreak
Connect it to the trailing ignitor. What's wrong with the stock tach anyway?
According to my haltech and my stock, the stock tach reads about 100 rpm too much, so its a little inaccurate.

At Idle I show 960 on the e6k, on my tach it says like 1100. At about 2500, holding it steady the tach is reading close to 2600. But its ok, I guess.
Old 09-13-02, 12:24 PM
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I thought green was for the tach signal?
Old 09-13-02, 04:06 PM
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Originally posted by MIKE-P-28


According to my haltech and my stock, the stock tach reads about 100 rpm too much, so its a little inaccurate.

At Idle I show 960 on the e6k, on my tach it says like 1100. At about 2500, holding it steady the tach is reading close to 2600. But its ok, I guess.
The stock tacho can be adjusted. There's a circuit board inside the cluster that contains a pot for adjusting the rev buzzer and another one for the tacho. I borrowed my friends Autometer tach to calibrate it so now it reads spot on.
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