So I checked my compression today because I can't get my rzr to crank.. I made a gauge at work last night with a 0 - 1500 psi gauge that we put on hydraulic accumulators.. took both plugs out where motor would turn over easy and I got no reading on gauge.. I put my thumb over plug hole and its got pressure in cylinder.. shouldn't it b reading something even 10 psi?? Is there a certain gauge to use???