Hey Ron
its about time
Ok this is simple make sure both valves are closed when doing this sometimes it will try to turn the engine you have a stick car so use the hand brake and put it in gear to stop the engine from turning that set-up should have instructions and different scales one gauge with show how much air from your compressor and the other with tell you how much of that air its holding in the cylinder look at the chart with your leak down set it will give you your percentage it should give you different amounts of air pressure to push into the cylinder on that chart so use 90 psi if your 10% or less your golden 10-15% its still ok 20 and more find where its leaking from you will hear it in the intake throttle body or exhaust pipes or crank case NOW YOU WILL LEARN SOMETHING RON!
This tool is always used when guys use heavy amounts of spray they use it between rounds to see if they are burning up there piston when leaning out the engine for MAX horsepower
If there is no instructions both gauges should read at least 100 psi start with your good side on the engine and write this all down cylinder# and what it leaks then go to the weak side they should all be close
