Fuel Pump Wire???
I figure the black to be the ground, and that yellow one to be the signal to the gauge, then the other one the power..but I could be wrong.

What wire are you looking for..the power wire?
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The Best V8 Stories One Small Block at Time
I used probably 6 or 7 of the little thin ones..I used a Drill with a 1/8" Bit on the corners to make it easier. Them little wheels really do cut through it like butter. You just take your time and let it eat through the metal and it's money.
You can tell by the pic it's a clean cut.










