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digital tachometer...for tuning

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Is it critical, when tuning a 2005 yfz450, to use a digital tach-to adjust idle speed, prior to rejetting the carb? In the service manual it says to do so, I have adjusted the throttle stop screw before to raise the idle @ higher elevations-in order to keep the bike running, but I do not want to harm the bike, by "tuning it by ear". I have a FMF factory 4 complete system, K&N filter in the airbox, needle on 4th clip, 170 main jet. I tried a 50 pilot jet but I think its too big, so I put the stock back in (42). If a tach is so important where would I find the proper one for just tuning a bike? thanks

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