Go for the "presto" effect. Sears has them for $30. Buy an Engine Compression Tester. It will have the gauge, a quick release hose, and an adapter. DO NOT try and make your own. Since it seems that you haven't done this before, here are the instructions:
For accuracy, you MUST perform the compression tests with the engine as close to operating temp as possible, and have the throttle blocked open.
In short:
1) Warm up the engine
2) Disconnect the coil
3) Block the throttle so that it is wide open
4) Remove all 8 spark plugs
5) Install the tester and crank the engine through 5 revolutions
6) Read and write down the results
7) Repeat steps 5 & 6 for the remaining cylinders
Take care,
-Chris
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