Bill, did you ever hear the story about the P&G gapper when the inventor took it to Iskendarien and demanded he try it? What he really wanted was an official endorsement. Ol' Ed told his machinist to set the valves carefully per the P&G directions, on an unblown Chrysler drag engine that happened to be on the pump. They did a dyno run & logged the results. Then Ed said, "now, set the valves quick and sloppy like we were at the track & you only had a few minutes between rounds" As you may have guessed, the second dyno run showed a few % GAIN in power. The P&G guy left shaking his head. Point is, sometimes real precision settings mean less than getting a combination that works for your machine. I wouldn't spend extra for a microprocessor to tell me if a motor was lashed right, personally. I'd set it, run it and if it needs a tweek, I accept that. Engines are female, I'm convinced!