i worked on most of the harness today and i herd the function of this solenoid is not to let the car build boost in reverse. i would like to wire it to a switch because my gears suck and my rpms stay high at 70 so maybe i can keep the valve fully open to save some gas on the highway (i do a ton of highway driving on the way to work). not sure witch wire needs positive and witch one needs negative. thanks