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Discussion Starter #1
I have the tach in my 66 Mustang hooked up to the coil but when I start the car it jump to 500 RPMs and stays there no matter what RPM I really am at. Any ideas of what the problem may be?
 

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A few things to double check ,
1. make sure the tach is grounded properly (black wire )
2.make sure the green wire is going to the negative (-) side of the coil
3. make sure the tach is set to the proper amount of cylinders that your car has ( they usually have a switch marked 4/6/8)
 
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