Been working on putting together a true basket case 1992 W350 G360 4x4.
Got everything figured out except two things.
-AC wont engage
-Speedometer won't work.
As far as the AC I flushed everything, converted to R-134, New expansion valve, accumulator, AC cycle switch (modified to bypass PCM), vacuum pulled and charged. I can hotwire the compressor and it works but it wont otherwise.
For the speedometer, I haven't verified the VSS is working or the gear reducer, but I'm mostly curious does the PCM control this being it is a 92? I have had to bypass it with an external regulator so I know the PCM is bad.