I have a 2000 m750, and I've never cared much for the instrument panel that came with the early Monsters, so when I saw a 2001 900ie instrument cluster on eBay for a reasonable price I jumped on it. I installed it yesterday, and the tach is a bit disappointing. It jumps by at least 500rpm around the speed the engine is actually going, constantly jumping and never giving a steady reason. The text on the gauge should say "x1000 sec^-1 +/- 500" what level of jumpy-ness is usual, and what can I do about it? I've seen some say that it's a flaky ground on the board, but how do I get at the circuit? Do I have to take the guage apart from the bezel or can i take it apart from the rear? I tried to take the speedo that came with this apart mostly out of curiosity and I made a mess of the bezel; I'm not sure I want the tach to suffer a similar fate. Any advice or comments on how the tach should perform would be appreciated.
Thanks!
I'm not familiar with your specific tach, but on my M900 (1996), the tach movement was more or less a factor of its connection to the electrics. Meaning that it may not be in the tach itself, but its connection in the battery area (if I recall). The tach reads either the flywheel or coil pulses unless I'm way way off base.
I'd do a search on tachs, phone up some parts shops and see what you can find out.