Thursday7

So I'm wiring up my oil press. gauge and I want to splice a wire for the backlighting. I figured I'd use the climate control wires because I'm mounting my gauge right above that, and want to have the gauge light come on when they are lit. Which wire should I splice into? The FSM's wiring diagrams aren't being too helpful and I don't have a Chilton/Haynes.
Thanks

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WTB SR20 *Non-Rep* Bottom Mount Manifold
WTB Bride Zieg II