| It's not the stator-regulator connector. Electronic tachometers give erratic readings when the base voltage is low, usually caused by a loose connection.
Most likely - Intermittent power or earth connection
Next likely - Intermittent RPM signal connection
Least likely - Tachometer internal problems
Check for a loose or corroded electrical connection at the battery, the fuse, and any in-line connector. Check the two battery connections first, next the connector at the instrument cluster, then at the fuse, and lastly at the wiring harness connections.
Next, since the bike is running OK, the RPM sensor gap, the sensor itself, and wiring back to the computer are not the problem. So you need to check the connectors between the computer and the tach.
(If the engine cuts for a split second and then it returns to normal while the tach reading drops, the RPM sensor gap is probably out of adjustment.)
Try to borrow a tach to verify that it’s actually the problem, before buying a replacement. |