Thanks for the responses . Yes , the low press. switch is still located on the evap canister . It's the high press. shutoff switch I'm concerned with since the Trans Am harness doesn't have a plug for this one - or does it ? The only plug that's available , I thought , is the one to activate the clutch on the compressor . This isn't the one you're speaking of is it , GMC ? The wires for this plug have the silver insulation wrapped around them . The new Sandin compressor has a single pin , single wire only .