Hi, I started the bike up the other day after it had recently been serviced and the rev counter wasn't working. Is it something that may have been disturbed during the service ? I can't say if it was working or not when I picked the bike up, (3 miles to home & not used since)but it sure ain't working now. Any suggestions what may up with it if it isn't a loose wire/connector. Am just running the bike back to the dealership for them to have a look.
Check the two small black relays down next to the battery. Had same problem years ago on mine and new relay sorted it. Cheap and easy fix.