Ditto Tom's comments. As a rule of thumb you can use the compression ratio to ballpark what ideal compression should be. A 10:1 CR with standard atmospheric pressure of 14.7 psia would yield 147 psig if everything was good. Not an exact representation by any means but it serves to illustrate that 210 psig for a gasoline engine compression reading is horrendously high. And even if your gauge is faulty and #s 1 and 4 actually have normal readings, #3 is bad and #2 is dismal.