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to tap into the dash lighting, i grab a volt meter, turn the running lights on, stick the negative lead of the meter on any exposed frame i know is a good ground, and stick the positive lead on each terminal until i find 12 V. then i turn the lights off and confirm the same terminal has 0 V at that time. next i do the same thing but keep the positive lead on the known dash light terminal and move the negative lead from terminal to terminal until i find the ground wire. once i know which both of those are, i splice into the wires using scotch connectors and connect them to the vac gauge bulb. some people don't like to use scotch connectors but in interior applications that will not see any exposure to moisture or whatever, i find they are fine.
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