I have autometer phantom fuel pressure guage , here is my question when you shut off your truck does your needle go to 0 or up to highest setting? Mine goes up to highest setting then when I turn on key it goes to the pressure? Is this correct?

Thanks

 

Welp, depends.

Is it the mechanical or electric FP gauge?

Certain models act different.

I have a lunar series electric. When i shut off my truck, the needle doesnt move whatsoever. My +12V is hooked into the switched ignition. My trans gauge goes back to 0 with ignition off though.

 

it is electric