Welcome aboard.
The tach gets its sense from the negative terminal of the ignition coil. I would check the sense connection on the back of the tach. The most common fault is a bad tach which has a limited life time warranty from Faria so you can send it to them for repair.
A voltmeter can be attached to the gray sense wire, if it has a reading between zero and 12 V or is pulsing the tach is bad.
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1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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