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Old 12-12-2005, 09:41 AM
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Auto-Drone tach wiring ideas?

This is from my older brother's first car, a 85? Chevrolet Celebrity; 2.8Lv6 (fuel-injection), and the speedo didn't work so dad got him this here tach and used it as a speedo... (in gear A at RPM B = X mph kind of a deal)

Well, 2 weeks after my brother got the car I was with him going down a dirt road and he decided to be stupid with it and well we hit a tree and junked out the car. I guess it's better he killed it that way since he probably would've thrown a rod sooner or later with how he had a habit of revving the daylights out of it (6500rpm). Anyways I removed the tach before it went off to the iron graveyard.

Back to subject... a friend of mine has a 87 Dakota (3.9v6, carb) and we were going to use it to set idle speed.

Problem is, we don't know how to hook it up.

There's 2 red, 1 black, and 1 green. I do believe it has a little backlight fyi.

thanks!
-matt
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Old 12-12-2005, 03:47 PM
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Doc here,

Red=Power

Black=Ground

Green= Coil

That should do it...

Doc
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Old 12-12-2005, 06:22 PM
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The Green wire goes to the Negative side of the coil. Some ignition modules are very picky about loads on the Positive side, so be careful not to mix them up.
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Old 12-12-2005, 09:08 PM
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Wowza, Doc is "Our residential electrical expert" as I've heard him described before.

And TechnTool provided a valuable piece of info also.

Thank you both
-matt
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Old 01-19-2011, 08:40 PM
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I was looking at this, and sure this is an old thread, but why does my tach have 2 red (power) wires? Just seems strange. Wish I thought of that when Doc was around.

RIP buddy
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Old 01-20-2011, 07:26 AM
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You are still working on this 5 years later..? That is a long time for a tune up, hope you are not charging your friend by the hour..
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