Originally Posted By Cab_Burge
You need to read what pressures that gauge instruction sheet wants you to use, I haven't seen any leak down gauge that will work below 50 lbs of pressure, but there are a lot of things in this world I haven't seen yet also shruggy
A single gauge unit probably wants between 80 and 100 lbs., my two gauge aircraft legal calls for 80 lbs static before starting and the using the regulator to bring the first gauge (left hand side looking down at them) back to 80 lbs. with the valve opened reading the leakage so I would see 80 Lbs. on the left gauge and say between 78 Lbs. to 0 lbs. on the right gauge with a hole in the piston or a broken valve shruggy


It's a dual gauge setup. The instructions literally say "NOTE: Set the air compressor's regulator to 7 to 100 PSI. Never opperate this tester with air pressure set higher than 100 PSI which can damage this tool."

1970 EK2 T/A 727