Okay so I think I finally have the gauges working. I had to put an offset in the boost gauge as it was reading -12 to begin with, you should set the 0 when the accessory is turned on with the engine off yes? Had trouble with the EGT guage as the negative was actually the red (who the hell makes neg red!), but that is all fixed now.
With the boost gauge set to 0 when the engine is off, when I drive I can get the gauge to go close to 20 psi, I dont think this is normal. Have I set the gauge up correctly? Should I set the zero point when the engine is on an idling?