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Just got my gauge installed today. Looks nice. Only question is I'm at -18/19 at idle and only reading 13psi when boosting. Could have sworn I turned the WGA up higher than that. What is the max reading on the gauge?
 

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At lease 50 psi !
Make sure you do the ambient reset procedure, then with the key on and engine NOT running you should see zero. Make sure you did not kink the vac hose during installation or accidentally cause a leak. If you have one of those handheld vacuum pumps, set it to produce posistive pressure and connect it to the vacuum line on the engine side. Make sure the pump has never been used for brake or other fluids as that will damage the sensor in the gauge. Those pumps usually generate over 30psi, so this will help you find a leak. Else trust the gauge, these are very accurate.
 
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