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When I added AC to my CRX, I couldn't get the ECU to control the compressor. During troubleshooting, I wanted to make sure the compressor was working and hot wired a switch to the compressor relay. (on a Honda, the compressor relay coil always sees +12V, the switch is connecting the other side of the coil to ground). Finally gave up and that switch is what is turning my AC on. The pressure switch is inactive, but I make sure I don't leave it on for more then a few minutes at a time and it seems to work fine.
I connected another switch to the AC fan relay. The only headache here is that the idle speed doesn't increase to make up for the AC being on.
It also gives me the option of turning it off when acelerating, on hills, etc. Though you could do that with the standard AC button, if I ever got it to work.
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