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Secondary air gauge starts at 50psi

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I have an 08 Pinnacle chu mp8 . when running the the secondary air pressure is 150psi on the gauge and the warning light on the gauge is on. with the engine off I can bleed the tanks and pump the brakes until there is no air.  and sec air only drops to 50psi. either there is a sensor that I dont know of bad or the gauge is bad. the gauge is built into the cluster assembly. There has to be a sensor somewhere. can you help? I have no manual!

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