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I am not a bg fan of these electrics, maybe it is the old school in me liking full sweep mechanical gauges. I would be very inclined to install mechanicals if a gauge breaks here and 85PSI pressure switches to drive the horn and idiot lights... The twitchy sticky nature of these gauges may...

Interesting, that is backwards from how I am used to most electrics working... An open in the circuit or failed sender should give you a low reading so you know something is wrong, not the 120PSI reading you are liking and expecting to see on a properly operating air aystem:)

Well if it is already reading full, grounding the sensor lead won’t change anything, as low resistance to ground would indicate full needle deflection. If you disconnect the leads at the top of the sender then turn on the main power the gauge should fall to zero with no circuit thru the...

oops, double-tap...

You didn’t say what year/model, A0 or A1? On the A0 All of the gauges run on 24V provided by CB77... The air gauges can get wonky if the senders are not grounded properly... the sensors are under the drivers dash and are screwed into T fittings and into a 2way check valve that provides park...