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Seem to come in 2 variations: Wireless and wired.

The wireless ones come at a steeper price and seem very convenient and easy to use.

On the "wired" tachs, what do the wires hook up to, other than the high tension lead for the spark plug? Thanks, gents.
 

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the laser tachs aren't really easier to use, just work differently, imho, as you need to have a shiny spot on something rotating to do the reading (either a shiny sticker you put on it, or polish it up a bit), and then point and hold the reader at that spot to do the reading. If you are adjusting something based on the rpm, then you've got to go back and forth between adjusting & doing the reading. But, it can take a reading on virtually anything rotating, so you measure the rpm of other rotating things that don't have a spark plug.

The wired tachs generally have one wiring going to a spark plug wire, and then maybe power/ground connections if it's not battery powered.
 

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I don't think the wireless tach referred to is laser driven. The Tech-Tach TT-20K is an inductive tach. Just hold it someplace close to the spark plug wire and it will pick up the discharge. It also has a wire to physically connect the unit to the plug wire.
 
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