where did you buy this compressor from?? I find it quite odd thats its painted silver, All the original sanden compressors Ive bought new have machine finish on their bodies, the compressor head bolts are gold cadmium plated along with the pulleys.
And the pipe covers are blue and red. It should also have a sanden proprietary wiring connector for the magnet coil.
This looks a little strange. And always use a genuine dryer in the system and the correct expansion valve, a proper A/C parts dealer can look up the correct part no for you. All expansion valves look alike but they flow differently and severely affect A/C performance if you choose the wrong part.