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also, does anyone know where i can get an air pressure guage that will go inside the truck that reads past 150 psi? I just installed onboard air on my truck this week and im running 175 psi and i would like a gauge that went up to 200 preferably.
Depends on how you want to mount the guage. Any local plumbing supply will have one but it mostly likely will be pipe thread only and no mounting. However, companies like Johnson-Controls make them for boiler applications and have various mounting styles. Check a local HVAC supplier.