Hand held tachometer

I have a hand held tachometer with 8 & 6 cylinder scales. I want to read the RPM on a 4 cylinder tractor engine. The 8 cylinder scale should read half the RPM of the 4 cylinder engine right? Will the accuracy be effected? Thanks.
 

hand held as in a roller you put on the end of the flywheel or electronic tachometer?

If electronic tach, you multiply the 8 cyl by 2.
 

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