Got my new(used) western tank , hanger assembly...there are 2 blue wires and 1 ground on the hanger.1 blue just goes to a resistor? on the backside of the bracket..My car is an 88,,,think hanger is 90 up?Can i use a walbro 255 and just use 2 wires?...should i stick with stock till i get it running?..is the 12v mod neccessary?