2004 Silverad oil pressure
Its probably the wire to the gauge or the gauge/cluster itself(extremely common on GM fullsize trucks) You could install an aftermarket gauge under the dash or replace the cluster(very easy do it yourself project) if its not the wire.
How do you actually test the gauge?
Or with a volt/ohmeter how do you test the wiring?
You can use a volt meter to test both the wiring and the gauge.
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