When the gauge is set to off, it displays some random number that fluctuates, a little like O2 feedback, except it isn't because my Serial gauge shows me that and the readings are diferent. If I hold down button 1 it comes up with ErS and flashes all the LEDs red. Whats causing this? Also is it normal for the boost solenoid to click continuously when the ignition is on?

 

Check your solenoid valve wire connections.