You will need to cut into your wiring for the Greasecar electrical system. Locate the wire that you ran from the main fuel selector switch to the 6-port valve. These wires should be under the dash. Take your meter and be sure to ground the black lead to any piece of exposed metal on the car and with the red probe see which wire.
The relay is set up to switch between two signals when is supplied with 12v. power. So you want to use the red probe to find the wire that has 12v. when the kit is engaged the relay is essentially going to switch the signal from one tank sender unit to the other; sending the proper signal back to the dash.
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