G'day and welcome. It is not hard to take the tacho apart (but it is a bit harder putting it back together), so it may be worth checking that it is clean and dry inside. If there is dirts etc in it then the high humidity in your area could cause a few problems.
When yours sticks, do the warning lights work? Mine would stop working but if the one was on at the time the tacho stuck such as hi beam or indicator, they'd stay lit, even with the key turned off. Blinkers and everything else worked as normal and bike ran fine. I got the lights to go out by disconnecting the battery (only for a second) and then the tacho would be back to normal in the morning.
When yours sticks, do the warning lights work? Mine would stop working but if the one was on at the time the tacho stuck such as hi beam or indicator, they'd stay lit, even with the key turned off. Blinkers and everything else worked as normal and bike ran fine. I got the lights to go out by disconnecting the battery (only for a second) and then the tacho would be back to normal in the morning.
Welcome from Germany!
Your ears and the seat of your pants make a great tachometer! As for the indicators, they don't stand out enough to be useful anyway! If she starts sputtering, you need petrol; white smoke from front she's overheating; use the dipstick for oil (though mines never burnt any)....what else is on there? I really don't know and I've had it for 7 years?
Enjoy the ride !
Here is another Welcome from down South Coast NSW, only ever had my tach play up once I put some Dielectric Grease on and in all the connectors in the plug at back of it and not had any problems since, JMTCW