Electric tachometer repair

Has anyone had any experience rebuilding an electronic tach? I have a 95 kz1000P with a tach that stops working after a few minutes. I've checked all the connections, and they all seem clean and without corrosion. I have repaired mechanical speedometers and tachometers before, but i've never cracked open an electric one. Is it worth the trouble to get open or should I just get a new one.

I would start by checking the "crimp" connection in the loom where the tach takes it's signal from (one of the coil trigger wires) as these do corrode over time) you can check the signal pulse with an LED