It's an electrical gauge and the only part of wiring i'm positive about is the ground wire. I'm also not sure if i can use my stock pressure sensor, someone suggested that i would have to replace it with another one for some reason(still works)

 

Didnt it come with instructions?

 

Get a 1/8" "T" and put it in where your stock sensor is and put your stock sensor and your new one into it. Plug back in the stock one and run a wire to you gauge. Easy as that.

 

wich brand do you have?