I bought a harness and programmed PCM, got it in the truck and running.. It is in a 1998 2 wheel drive tahoe, when i did the install I unpinned all the AC and Fuel Gauge wires from my old harness and pinned them into the correct pins onto the new harness with the PCM.. I have no fuel gauge and the AC will not turn on.. I bypassed everything and put 12V to the AC compressor and it engages .. when these pcm's are programmed can the programming for the ac and fuel gauge be left out??