check guages warning

[rvanders37]

1989 silverado. 167,000 miles runs great. anyone know why the guages are going off scale high. fuel guage all over the place but mostly stays a 1/4 even when full. oil pressure reads very high almost full scale. temp guage will move to past 210 and eventually come back to normal. i don't suspect all the sending units would go at one time but don't know where to begin.

[Trouttrooper]

Sounds to me like.

 

1. Fuel guage has bad sending unit, probably has some corrosion or deposits.

 

2. oil pressue guage is bad. (I've seen a lot of that era p/u with bad oil pressure guages).

 

3. Temp guage is correct, probably a sticking thermostat.

[mmmikkke]

Sounds to me like you have a bad ground on your instrument cluster. Look for ground wires where they attach to the floor panel or firewall, under the dash, on the driver's side. Verify each is making a good connection. (Check with ohm meter.)