This is my on board air system for my 1990 Chevy Silverado K1500. The truck has a 5 speed manual transmission, 4 wheel drive, Chevy 350 engine, 241000 miles, and a lot of rust (it is a Wisconsin truck after all). The compressor is the factory a/c compressor (a Harrison R-4 compressor). I connected the inlet and outlet hoses of the compressor with hose barbs and clamps. The electric clutch is wired to a pressure switch on the tank and a switch under my dash. Feel free to leave any comments or questions below.