Our shop uses a tach much like the 1st one pictured. They have to mount a small metal reflective strip on a rotating shaft to get the rpms.
I purchased one of these. Have to double the RPMs, but the price was right.
http://cgi.ebay.com/Tachometer-Hour-...item2a0d6b34a6
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Papaw
1984 CCC 582 w/ creeper, 42" blade, 44C deck, 220# wheel weights, 2 link chains & adjusters, Spring assist lift.
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