I'm not yet sure if I need it - or if I do, how I'll go about it. Somehow, I'll need to take a trigger voltage from the compressor switch circuit and use it to switch a solenoid valve to provide air behind the throttle plate. I don't see why I couldn't run a bypass from before the throttle plate to the solenoid, then on behind the throttle plate.... trigger the solenoid with the compressor clutch switch.

I might find the FIdle relay circuit in MS useful for some function in the arrangement ..... just don't know yet.... it would depend on how much current one of the solenoid switches would draw.

Frank