I fail to see how a compression guage will answer anything becuase the only thing a compression guage will tell you is that there is no compression, something you already know. Also, compression is a varible, meaning just a litle versus a lot. Even if you discover that you only have a little, the guage isn't going to help you figure out what's wrong.

When you say compression, are you refering to the amount of cylinder pressure (measured by pounds-per-square-inch) that builds up as the pistion comes up. Or you talking about combustion? (Actually, it would be called ignition becuase you cannot have combustion without ignition.)

Is there no spark at the plug or is there no air pressure building up in the cylinder?