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The used unit I am looking at (140 speedo and oil/fuel/temp) has the circuit board included and that is where I can see the date stamp (J12170). I was thinking about replacing my 140 speedo and idiot gauge with this one and possibly swapping out the lens, if possible.

The tach was already installed in the car, but not working. I had ordered a repro awhile back to install, but wondering now if it was just an issue with whomever wired the old tach. Since the tach is not part of the 2 gauge cluster, I assumed when I ordered the new one, it would be able to be wired with a new harness.

What am I missing?