Remember reading old posts Re: high pressure A/C switch inside DRIVER'S wheel well. My compressor output line is defenitely uninterrupted there... Stuck head inside passenger wheel well on way to work. Never really worried about anything in there other than heater core because my R134 conversion went smoothly (unlike Dave Swingle, I jump compressor inside engine compartment)... Despite wiring diagram, are two indeed two electrical connections, and what appears to be a pop off valve. What has me confused is accumulator is in low pressure return line (what does it accumulate? Gas? Old Lincoln accumulators are at bottom of condensor and store liquid freon) and switch in it is 3 conductor. Wiring diagram clearly shows 2 conductor low pressure switch. If 3 conductor switch is low pressure, indeed opens at 25+ PSI, but what is third electrical line for? If 2 conductor switch is low pressure (correct me if I'm wrong Louie G, but didn't we force your compressor on there in SC), is on high side as I originally claimed, but what in the world is that switch in accumulator? Will fire up DeLo at lunch and experiment with switches... Bill Robertson #5939