So I recently installed a Defi Racer boost gauge. Installation seemed to go well with the only issue being some difficulty in snaking the sensor wire from the engine bay into the cabin (although I got it eventually).
I turn the ignition and the gauge seems to be working normally; at idle the needle sits around -20 inHg. The problem is when on the thottle at most the needle jumps to 0, sometimes around 5 psi (but then quickly falls) if I really mash it.
I don't know if the gauge is defective, I installed it incorrectly, or I have a boost leak somewhere (although if the gauge is working that would mean I'm getting no boost at all, and wouldn't that be noticeable?).
I'm not sure what to do here. Any suggestions?