Quote Originally Posted by green-lantern View Post
PSI Sensor= Int. Use internal pressure sensor 0.0psi to 36.3psi. Note that it does not measure vacuum.
PSI Sensor= Ext. Use external 4.0 BAR greddy pressure sensor (vacuum to 43.5psi) .

If I'm reading this right it appears I can use an external pressure sensor but I'm not finding any instructions on hooking that up. I was wondering if my old greddy profec could be hooked to this thing and show vacuum. The greddy doesn’t control boost anymore but it still reads boost on the screen.
If you disconnect the internal pressure sensor and hookup an external pressure sensor to it instead, it will work. Kinda difficult to do afterwards, that's why the "newer" version will have an external connector making it easier to switch between internal and external sensors. And no, don't use the aux input.