[carmine]

Regarding gauges.
Seen this problem before.
Nothing wrong with Superformance gauges.
Installer has to tie down ( plastic zip ties) the sensor wire aproxanatly 6 inches away from the screw in sensor.
If not tied down the vibration eventually will create a crack on the tube containing gas at sensor end thus allowing gas to escape and then no more gauge reading.

Licences installer should know this.