These are two separate issues. The speedometer probably has either a clogged or disconnected pitio tube at the drive. The tachometer may be bad, does it respond if you tap on it? The gray wire is the sense is it connected?
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1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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