HF meters

[Lkdelta]

I know, I know... HF,..... but

Does it make a difference how many cylinders there are, when using a clip-on tach?
In your opinion....Do clip-on tachs really work, & fairly accurately?

http://www.harborfreight.com/lcd-automotive-multimeter-with-tachometer-kit-95670.html

 

[Lkdelta]

Dropped fast, maybe bump once.

 

[zkling]

Think about how RPM is determined from measuring a spark firing. What you are really measuring is frequency the meter just calculates RPM for you.