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I'm not up on the technology, but I'm guessing the cheaper bike speedometers use a magnetic sensor on the forks or frame, and a magnet on the spokes. Ergo they'd be a PITA to install on a car. The expensive ones may use GPS. An Ultragauge looks like your cheapest and simplest option.
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Darrell
Boycotting Exxon since 1989, BP since 2010
Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac? George Carlin
Mean Green Toaster Machine
49.5 mpg avg over 53,000 miles. 176% of '08 EPA
Best flat drive 94.5 mpg for 10.1 mi
Longest tank 1033 km (642 mi) on 10.56 gal = 60.8 mpg
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