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Testing a factory tach?

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Is there any way to test a factory '72 510 tach before I put it in the dash? I have no motor in the car and all the stock wiring is disconnected and hanging around the engine compartment.


Would love to know that it works before putting it in the dash when I replace the dash pad.


Thanks in advance.

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I had one tested at a shop that does speedometer repair.He hooked it up to some sort of electric machine and actually calibrated it.

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