A/C Head Pressure Switch bypass pinouts needed??

[C4TOMCAT]

Hello all

Its been awhile since I have been on here. My 94 coupe/6 speed had the opti/H2O pump go out in Dec and just got it back together but I had to open the HVAC lines so the charge is gone and I do not have time to recharge till later.

I am taking the car to the track this weekend and need to be able to run the passenger side fan but with the refrigerant charge out of it the fan cycling switch (three prong on the liquid high pressure line near the evap housing) holds the circuit open.

I am not sure of the wiring circuit for closing so can someone tell me which wire colors to bypass together to allow the fan circuit to run when I put the panel to a/c so the fan will operate.

The colors of wire are black, red, and either its gray or a dirty white.
I am sure the PCM grounds out to cause it to operate but don/t want to cause more problems by hit or miss on trying it.

thanks in advance for any assistance you can give.
Tom

[irfgt]

The part is a pressure transducer and not a switch which sends a variable voltage back to the PCM to control compressor function. The white wire is the 5 volt reference, the black is PCM ground and the red is the return signal back to the PCM. You can make the call as to which wires you wish to jumper.