For me I need a tach that is precise, not so much one that is accurate.

I really don't care if my engine is turning 12,500 and my tach is showing 12,000 as long as it's precise enough to show small variations as you adjust the needles. I'm sure the top end tachs are precise AND accurate (not the same thing) but my cheapy hobbico one has been precise enough for my casual use.