I had the OEM tach installed at the time of purchase. I particularly liked it when I was breaking the bike in, since I was told to stay within 5000 rpm's for the first 400 miles or so. I use it less now, but I like having it. I'm on my second one though. The first one got stuck anywhere from 1000-2000 rpms when I turned the bike off. Had to flick the kill switch a few times to get it back to zero. Apparently some issues with a particular batch of them. The second one has had no problems.
