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Which line to tap?

5K views 21 replies 6 participants last post by  ctown95 
#1 ·
Just installed a boost gauge and I'm working on the wiring. I am going to tap into the headlight and dimmer switch, so the gauge will dim with the interior lights. Wondering which one of these wires I should go with.

Top side:



Bottom side:



And I'm also wondering where the best place to a run a ground is?

Thanks in advance.
 
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#9 ·
Dont cut the red one...............

wait , the black one.......... erm......
 
#22 ·
Heres how your wires need to be connected, black needs to go to the groud screw which is located straight back from the headlamp switch, your white wire needs to be hooked to the red/green wire. I think wat you did was hook your white wire to the red wire which always has power to it. The red/green wire only has power to it when the headlights are on. Hope this helps
 
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