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Sid Squid · 12-09-14, 06:34 PM

Tachometer and speedo pickups are not connected or reliant on each other.
OP: I suspect the tacho is knackered, if it doesn't go back to zero when the battery is disconnected then the wiring isn't relevant and the instrument itself isn't working right.
There is no 'coil pack' there are two coils, the tacho has a single connection to the front coil LT- and simply counts the pulses from the ignition unit to deduce engine speed.
Seeing as the engine runs OK then the coil connections are proven good, clearly the connection from the coil to the instruments inside the loom could be broken, but if it were then the tacho would simply not work.

12-09-14, 06:34 PM	#8
Sid Squid No, I don't lend tools. Mega Poster Join Date: Jul 2003 Location: Skunk Works, Nth London Posts: 8,680	Curvy tacho faulty. Tachometer and speedo pickups are not connected or reliant on each other. OP: I suspect the tacho is knackered, if it doesn't go back to zero when the battery is disconnected then the wiring isn't relevant and the instrument itself isn't working right. There is no 'coil pack' there are two coils, the tacho has a single connection to the front coil LT- and simply counts the pulses from the ignition unit to deduce engine speed. Seeing as the engine runs OK then the coil connections are proven good, clearly the connection from the coil to the instruments inside the loom could be broken, but if it were then the tacho would simply not work. __________________ If an SV650 has a flat tyre in the forest and no-one is there to blow it up, how long will it be 'til someone posts that the reg/rec is duff and the world will end unless a CBR unit is fitted? A little bit of knowledge = a dangerous thing. "a deathless anthem of nuclear-strength romantic angst" Last edited by Sid Squid; 12-09-14 at 06:42 PM.