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WL RPM not displaying correctly/faulty tacho?

vthed

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Joined
Mar 9, 2016
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Adelaide, South Australia
Members Ride
WL Caprice 5.7L
Having some issues with my WL Caprice 5.7L.

Car runs great bar the issue I'm having with the tacho.

The car never misses a beat and is great on fuel and power. When I start driving the RPM seems to be correct but as I drive (probably within 5-10 minutes), the RPM starts to drop and eventually the needle will be sitting on the stop below zero.

It still moves on acceleration but is obviously not the RPM the engine is running at.

Could be signal wire? Cam position sensor?
 
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