The most accurate by far and the easiest to install by yourself is a GPS. You can go to best buy and get a GPS that has maps and odometer reading, Clock, search functions etc. etc. etc. and they are very inexpensive now. I use one on my cart. If we go to a party at a home that is new to us, just type in the address and the GPS guides you right into the drive way. The clock and odometer is very very accurate. No mechanical parts to worry about.
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