normally i don't recommend the cheap route when it comes to tools, but i bought the $25 compression tester from harbor freight and it is actually not bad at all for the price. it came with the correct adapter and worked just fine for me. i figured for so cheap, if it was that terrible i would just trash it and buy a better one...but it's earned itself a place in my garage for the time being.

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1983 300D classic white 196,xxx
2007 toyota yaris lb
2007 nissan versa (wife's)
2001 nissan frontier
2006 bmw r1150gs
2001 ducati monster 900
2003 zr7s
2007 klr650