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The most expensive part of electric manual is the pressure gauge:)

Sadly you have nothing to troubleshoot. 5 solid lights is an internal fault in the controller. Nothing left for it but to use it as a coaster or a coffee table conversation starter… either replace it with OEM, Plasa’s arduino based unit or go manual like I did(mine was 5 solids when I got my...

That shouldn’t be an issue as I believe it connects to a hose on one end. It is just a PITA to get to and wrench on it:)

Well the pressure gauge sender and warning switch are in the same unit, so swapping gauge heads/sensor wires should help you narrow down which is acting up...

A lot of times that single check you pictured and the 2way checks behind the drivers grill simply get crap in them, but more than likely they have some internal corrosion.. the air leaking from the red gladhand can come from either that valve or the 2way. Noting when it is leaking can give you...

Yep the fronts are innies, but must be vented when not in use as a leak in the checks downstream can cause issues if that air is not allowed to escape thru the vented covers. The most likley place for a leak are the 2way checks under the drivers floor/behind the grill. The top one connects...

I had to remove the bottom plastic cover , then you can simply put a wrench on the hex head on the sensor...

You need engine running and wet tank full to activate the pressure switch on the wet tank so CTIS can start its thing. A CTIS inflate command will drain the wet tank down to the 85 PSI protection valve close point in 3-4 seconds... those tires take some volume... For quiet, you can connect shop...