Hi. Hopefully somebody can help me out with this. I bought a single phase clarke airmaster compressor off a friend recently & found the pressure switch had gone as it didn't stop at the max working pressure. I ordered a replacement switch but the wiring instructions are terrible & it's a 3 phase switch which is compatible with single phase. Any chance anybody could tell me which terminals to wiring in to as i have two wires but three terminals. The pressure switch is an Italian thing by Ne-ma.