check your gauge, I've got three different gauges that read 30 psi difference between them, I've a got a selling gauge
, buying gauge
, and one that reads correctly. Normally if they all read close to each other, thats all you need. I did an engine check out for a customer buying a boat, compresion on both engines came well withing spec around 125 psi. He called me after taking delivery all pissed off because his mechanic said both engines were worn out, he said his gauge read 80 psi. I told him to get another gauge and another mechanic. He called back two days later and apologzed to me, he took it to anotehr mechanic and it checked out OK