Me and a buddy put an electronic fuel gauge on my 2006 REV last month. We went slow to do it right and it took a couple hours. But $100 does not sound bad to me at all to have the dealer put it in. You will need to take off the seat and much of the panel pieces around the bars and current mechanical gauge. There is a template on the top of the tank to cut a hole and install the sender. Then you pretty much connect it into the plug unit is already pre-installed. The electronic gauge is way better than the old mechanical.
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