This has been a cascading situation. I was going to remove my heater because I don't get air out of the defrost ducts even with the fan obviously working, no matter where I set the heat lever to on the heater. Getting ready to pull out the heater and I noticed that I had fluid leaking out of my clutch master cylinder inside inside the cab, and eating the paint. The previous owner had done a complete body repair and repaint and he did a good job.I also had recently started having problems shifting into reverse. So I ordered a replacement clutch master cylinder, replaced it, and bled the system. In the process of changing the master cylinder I had a lot of problems getting the clevis pin out of the clutch pedal, and had moved wire bundles around. After the system was bled I had no problems shifting. But none of my instruments except the amp meter were working. Looking at the schematics I checked the fuse, which was ok. I got a voltmeter and checked it at the fuse and it read 11.7 volts. The schematic said that the power wire for all of the non functional gauges was a blue/red wire. I don't see any broken wires but I can't really see everything up there clearly. Anything else I should check, and if I have to pull the instrument cluster do I need to disconnect the speedometer cable and if so do I do it at the transmission or at the gauge or both?