Jim, if you have a smart phone you can download a GPS speedometer app for free. I have an android phone and downloaded Android-Speedometer and it has all kinds of other information than just your speed. It also offers HUD (heads up display) for your viewing pleasure.
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Jon & Chris Everton
1986 40' Dog House #86
0 hp 8V92 Allison HT740
Soon to be 500hp ISM with ZF 6 Speed
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