1999 GMC Sonoma Fuel gauge level misreading

So have you checked the purple wire for the guage making sure it isn't broke or frayed? I would also check guage itself could be a bad guage. If you need help with wire colors let me know and we will see what we can do to fix it.

I did not check the purple wire, I will do it tomorrow, and will get back to you, I was thinking about the black wire which suspose to be the ground.
Which color of wire is the ground for the gauge?
I attached one pictur of my race car, so you see I am a dragracer, It a Vega made by Bill Jenkings, runs 8.90 with a 481BB Chevy and powerglide
transmission.

Thank You,


William

The purple is power the orange with black stripe is pressure sensor feed that is all there is for the sending unit. The instrument cluster is grounded with a black wire there is no ground on sending unit.

Ok thank you for the information, I will check both.

Let me know how it goes and we will go from there if needed

We checked the purple wire with a ohm-meter from below the fuse box to the connector wire, but it seem the the meter give connectivity on
all the 3 purple wires on the fuse box. Checked the orange wire also got connectivety with the coonector.I gues the problem should be on
the dashpanel itself. It is for me verry confusion.

I tend to agree. I would check what it would cost from your local parts store and a local wrecking yard. Should fix the problem.

Yes thats what we onna do see if we can find one (wreckiing yard) locally, otherwise I have to order one. I will let you know.
Thanks,

Sounds good