So i installed a autometer sport comp boost guage, went out for a spin to see how it was and floored it, hit 15 psi and let off the trottle, the guage came down to 5psi and woulkdnt go under it, hmmm weird, ok shut the truck off and its still at 5psi, remove the boost guage from th truck, you guessed it 5psi, defunked guage i guess, will return it tommorow, my real question is, where are you guys getting power from for the light inside the guage? i want a sorce that only turns on with the headlights, any suggestions?