got a 1999 gmc sierra 1500 4x4 with the 5.3, im looking for a fuel regulator but not sure what psi I should get. my gmc manuals call for 55-62 psi. AutoZone carries 1 but its only rated at 50 psi. I've been checking others (advance auto parts and, Napa) and they have some multiple pressures up to 65psi. called the dealership they have no ratings on the one it calls for. don't really want to spend $140 on regulator from dealership. anybody know?