Definitely do the mechanical gauge thing!
This is the only way to know stuff for sure!
NEW STUFF CAN BE BAD TOO, Been there-Done That. Lots of times, makes you spend unnecessary time chasing a ghost!---Maybe same with the OEM gauge, wiring, etc
You can run a mechanical gauge set up, like mine, out of the hood, and into your window. Then drive normal, see if it acts the same as yours. Even when hot. Mechanical eliminates any electrical factors out of the equation!
The plastic tube and fittings are from a auto parts store--you can get a gauge there too (mine is from a plumbing supply house, 0-100 PSI), even if it's for under dash mounting, it'll still work! You might even want to mount it permanent later.
Keep us informed
Wednesday, May 11th, 2011 AT 11:12 PM