I have a 93. Auto. 4x4
It has grounding issues that much I know. However I think it may have several.
The speedo will read and rack up miles just idling. The dash lights need a smack of encouragement to turn on most times. The fuel gauge reads totally erratic, sometimes steady bot not correct, other times it hangs out at either way full, or way empty. And my newest trick is the lights (all of them) now pulse when the truck is on and running. But burn steady when off and parked. Its sorta like a rolling strobe effect. I got a disco going down the road. The light pulse seems to be in time with the speedo pulse. The speedo will pulse in about a 20mph swing. Sometimes it hangs out around 30 to 50, other times it decides to head over to the 80 to 100 range.
Now while I don't mind driving a mobile rave lighting rig, I have a feeling that something just isn't right.