I bought a used garden tractor a couple weeks ago. And I'm trying to get it running. I'm not sure that i'm doing the compression test properly. I took both spark plugs out and connected my tester into one hole. I cranked the engine over, and nothing. No reading. The needle dances around slightly on zero. Then I checked the other side. Same thing. Zero. Does this sound right? Does it matter if I have the carb and intake man. off the engine? Shouldn't I get something on the gauge? I haven't used this compression gauge in years. Maybe it's broken. Maybe I should buy a new one and try the test again. I really, really, really hope I'm doing something wrong and the engine is still good. My smoking hot deal isn't feeling so hot anymore.