Stock tach problem - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 4 Old 05-04-2012, 02:50 PM Thread Starter
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Stock tach problem

Hello all,

I have an 87 5.0 that has been converted to carb. with MSD 6AL ignition.

I wired in a 8920MSD Tach adapter so that my stock tach would work. It worked for a day and now some time it works and some time it wont. any idea where to strat in diagnosising the problem? I verified the ground and power to the tach adapter to ensure nothing came alose and all is well.

-the 8920 I have is a used one should I try replacing with a new one?
-For the tach feed I wired into the color coded wire coming from the instrument cluster.

Help please....

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post #2 of 4 Old 05-05-2012, 10:15 PM
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I have two friends taking the tach feed from the msd box to the oem tach wire. Works for them


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post #3 of 4 Old 05-05-2012, 10:37 PM
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^^^ tach out from the 6AL to the tan/yellow wire(I think) in the plug near the booster works for me.

1989 Mustang GT original oxford white On3 5.0 and 4r70w swapped. Self-tuned with a Moates QH and TunerPro RT. Daily driven!
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post #4 of 4 Old 05-06-2012, 11:10 AM
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Quote:
Originally Posted by SlowBox View Post
^^^ tach out from the 6AL to the tan/yellow wire(I think) in the plug near the booster works for me.
Yup thats what they did, the harness wire changes colors depending on years i think though.

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