I use a non-contact optical tach that reads off of a piece of reflective tape. I picked it up off amazon for less than $20.
https://www.amazon.com/Digital-Photo.../dp/B001N4QY66
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Adam
1964 Model 100 w/ K301 12hp and custom hydraulics
1972 Model 149 turned 129 w/ K301 12hp, triple hydraulics, 66 series clone
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