Check guages light on 1988 C/K 1500

[96Offroad]

The check guages light on my 1988 Cheyenne 4x4 is coming on and the oil pressure guage is erradic back and forth from low to high pressure.

The vehicle is a 4.3L manual.

Any suggestions on a likely cause or where to start with troubleshooting?

Thanks

[777stickman]

Could be the oil pressure sending unit or the wiring going to it. Unit is located next to the dist on the drivers side.

[96Offroad]

I will check into this and indicate what is determined (probably within a week).

Thank you