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Old 04-04-2021, 10:59 AM   #1
Join Date: Feb 2019
Posts: 13
Default Tach / RPM

Hi all!
My tachometer hasn't been working for a while and today I found this.. see pic.
Guess that's the problem, where do I connect it?
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Old 04-04-2021, 11:15 AM   #2
mmwjr's Avatar
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 8,533

The tach sense wire is gray and is connected to the negative terminal of the ignition coil. That wire looks to short to reach the coil and may be a extra wire for diagnostics. Try disconnecting the gray wire from the back of the tach and using a voltmeter see if you get a reading while the engine is running. If no reading the wire isnít getting signal if you get a reading the tach is bad.
1997 2400 SCR
5.7 Vortec / Bravo 2

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rpm tachometer

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