Oil pressure gauge - pegs right...

7900_Blazer · Apr 6, 2026

Oil pressure gauge on my 1985 K20 historically has worked with no issues - replaced the front clip and the bed, new tanks etc. Cranked it for the first time in a year or so and now the oil pressure gauge pegs to the right. It seems to peg the right after cranking it (truck cranks up perfect and runs as it always has)...

Most likely culprit? What would you look at first?

Thanks as always!

Ricko1966 · Apr 6, 2026

.

7900_Blazer said:
Oil pressure gauge historically has worked with no issues - replaced the front clip and the bed, new tanks etc. Cranked it for the first time in a year or so and now the oil pressure gauge pegs to the right. It seems to peg the right after cranking it (truck cranks up perfect and runs as it always has)...

Most likely culprit? What would you look at first?

Thanks as always!

Sounds like the wire to the sender got grounded. Maybe pinched under the cowl panel.

idahovette · Apr 6, 2026

If this is truly a 75 it should be a mechanical gauge?? Try a different add on mechanical and see what it reads

7900_Blazer · Apr 7, 2026

idahovette said:
If this is truly a 75 it should be a mechanical gauge?? Try a different add on mechanical and see what it reads

I should have originally posted this, but my truck is a 1985 K20...

idahovette · Apr 7, 2026

Yeah, I went back and read your original post.......read and comprehend, right? I just went by your avatar, my mistake @7900_Blazer

Matt69olds · Apr 7, 2026

Disconnect the sending unit and ground it. The gauge should read zero. If it doesn’t, or still pegged out, check the wire for a short to ground. If the gauge does go to zero, before digging too deep I’d replace the sending unit.

Oil pressure gauge - pegs right...

7900_Blazer

Full Access Member

Ricko1966

Full Access Member

idahovette

Full Access Member

7900_Blazer

Full Access Member

idahovette

Full Access Member

Matt69olds

Full Access Member

Similar threads

Latest posts

Forum statistics