dual gauge leak down test help

[Flatoo8@aol.com]

I recently was given a dual gauge leak down tester to replace my homemade 
single
gauge unit. No instructions (can't complain, free is a good price). I am 
confused (old). How do I use this thing? I know about getting the cyl.s @ TDC 
but after that ...? To confound things, this is a two stroke engine. TIA, 
Chas.

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