[a793aa]

Is your engine's RPM at idle getting bogged down excessively when the A/C clutch cycles to ON?

 

[a793aa]

Since the compressor clutch is engaged by sending power to it you can add a power-switched Bosch-type relay to its circuit that will give your FiTech system a ground signal. You'd wire it like so...
View attachment 863148

Interesting. The A/C clutch +POS signal that triggers a A/C ground signal.