Not for competition, you could get an automotive relay large enough to handle two compressors' maximum current. Then, wire the PCM compressor outputs to the coil on the relay, and power the compressors IN PARALLEL through the relay with a separate breaker/fuse. (If you wire them in series, you will get much worse performance!)
Edit:
Quote:
Originally Posted by IndySam
Even simpler just wire a relay (or two) through the pressure switch and avoid a PCM altogether.
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Well, yes, that too. True story: Our rookie year, we wired the compressor directly through the pressure switch. Somehow the inspectors missed it, and we didn't realize it was illegal until I read the rules the next build season. As it was illegal and we won't do it again, I have never gone back to see what the current limit is on that pressure switch.