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ChevyTech · 11-02-2008, 09:48 AM

It does sound like a ground problem, but also consider the possibility of two problems.

It is very common for the oil sending units to fail on these trucks and if you unplug the oil sending unit the gauge will go all the way to the high pressure end.

These dash panels do have issues with losing connection where the connector plugs on the back.

I have looked up the ground path for these trucks in the past but nobody has ever pursued and repaired the turn signal making the volt gauge swing and gotten back to me about it. If I remember correctly the instrument panel ground wire connects to the chassis right next to the ALDL connector.

11-02-2008, 09:48 AM	#2
ChevyTech Registered User Join Date: May 2004 Location: Minnesota Posts: 4,620	Re: Dash problem on 1990 K1500 It does sound like a ground problem, but also consider the possibility of two problems. It is very common for the oil sending units to fail on these trucks and if you unplug the oil sending unit the gauge will go all the way to the high pressure end. These dash panels do have issues with losing connection where the connector plugs on the back. I have looked up the ground path for these trucks in the past but nobody has ever pursued and repaired the turn signal making the volt gauge swing and gotten back to me about it. If I remember correctly the instrument panel ground wire connects to the chassis right next to the ALDL connector.