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Discussion Starter · #1 ·
I was sifting through the last years topics, and couldn't find the one on bench testing. So I am asking for some help. I pulled the tach from the dash. It had worked for a couple of years, then one day decided not to work. I know the light blue wire is ground, so that leaves dark blue, brown, gray, and pink. I remembered reading about using a drill with an old distributor and battery. I don't remember how it all gets wired together. If the bench test doesn't work I will need to send the tach out. I hope somebody has had success with getting their tach fixed. I need my tack to work again. The more gauges to gaze at the better. Love to cruise in my '67. Thanks boys!

Premium Member
2,221 Posts
The connections are as follows:

Light blue – left blinker light
Gray -inst. cluster lamp
Pink -inst. power (hot with ignition on)
Brown -RPM pulse (connects to coil)
Dark blue -? Could this be black? If so it's ground.

My tach. (part #6468499) has the following wire colors.

White – connects to light blue
Gray - gray
Red - pink
Brown – brown
Black - ground
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