Hello. I have Fiat 126p. I have a Mera Lumel tachometer installed in it. When I connected it, the tachometer was working. After 2 months the tachometer has stopped working. Ie. when I start the toddler, the tachometer shows all the time 2000 rounds. And my question. Why did this happen ??? The rev counter is broken? Or maybe the coil is broken ???