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Old 04-27-2014, 05:29 PM
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sailingchance sailingchance is offline
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Original Tachometer Wiring?

I have several wiring diagrams for the A4 but I can't seem to figure out the proper way to wire my Tachometer. It is the original tach. I have no idea if it works. I've been running the engine by sound and when necessary, using a laser tach.

I HAD it wired to what I thought was correct. The grey wire with the quick disconnect goes to the Coil + right? I've several variations with the larger posts. At one point, when I had it wired, if the grey wire wiggled at all, the engine would die. It was a loose connection, I'm guessing, but I've never so much as seen the tachometer move while the engine is running.

until I can figure out how this is wired, I wont know if it works. I also have to check the engine with e laser to confirm my RPMS.

Anyone know how to wire this thing?

I have an early model A4, points, condensor, 35amp motorola alt with external regulator.

Here are the pics

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