Legality of using a pressure sensor on the high pressure circuit?

[Tristan Lall]

You could always pull the transducer cable and jumper the analogue pins to allow an unrestricted fill. That's a little more difficult than just shorting the Nason switch, but it's not that bad.

(I just thought of one surmountable complication: if the transducer is disconnected, the system should shut the compressor off. Therefore the transducer needs to either have a scale that doesn't intersect 0 V, or needs to scale so that 0 V represents some off-scale high pressure.)