On mine the pressure switches went to the computer and the the computer controled the the relay. SO I took the computer out of the system. I used the the pressure switches to control the relay. The computer sends a ground signal to the relay and the presure switches use a positive signal to the computer. So now the wire goes from the pressure to the relay coil and the other side of the relay coil is grounded.
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97 Dodge shorty, 4x4, 12v, Farrell 13mm pump, Ducky 5x25, 75mm over 95mm, 48re, Anteater
06 Chevy shorty, 4x4, efilive
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