Fitted a boost gauge to my 99 t5. It's a digital one (tube from the engine bay to a remote sender that sends an electrical signal to the gauge) on tick over it reads -10 psi and in full boost only 1 or 2 psi. I have a Bluetooth obd2 reader and that's telling me the car is boosting to about 11/12 psi and peaking at 15. My car is an me7 and I connected the gauge to the pipe running from the inlet manifold (no tree on a me7) is there a better place to connect too? Is the boost gauge faulty,the car faulty or have I done something wrong?