from what i've "heard" autometer is + or - 20% off give or take....i don't know, like i said i just "heard".....and pivot is actually one of the most accurate...to the point when your motor is stuttering, the tachometer will also react the same, the needle will bounce up and down...how bout others? such as apexi, etc...

please send some input!

thanks in advance

 

i don't like autometer products, but apex is pretty good. e.g. - vafc is an excellent way to track rpm

 

oh yeah....from what i "heard" again, the vafc IS the most accurate....but it's not a tachometer per se