tachometer upgrade

[the_63]

Hey guys,

Long time no see. I have been getting prepared to swap my mechanical tachometer over to an electric one. I'm sure I've seen a thread on this somewhere before but I can't find it 

does anyone know how the electric tach gets its information. As far as I can tell from the wiring diagram the wires used to power it are from the dummy lights and has an extra wire that goes to the ignition.

Any help/insight would be much appreciated

Chris

[gregjet]

Aftermarket Tach signal can vary between different instruments, Some need the tach wire, some can bleed tach signal fron the coil or even an inductor wound around the spark wire ( often with a resistor).
I used an ACEWELL as I have used them a fair bit on race bkes, but there are heaps. The Acewell can use a 5v tach signal wire, coil bleed or an inductor wire which is why I have favored them. It is in the project pages under xxxBundberg projectxxx.
There are some very nice analogue electronic ones in the project area though.

[Joolstacho]

Why?

[sledge]

Compare the wiring diagrams between the Es that don't have an electric tacho and the Fs that do.



Or am I just thinking too hard 

[gregjet]

You need to say which model for the gs to be sure of the tach wire coding.
On the 04 and05 it is a black/red wire and there is a bullet connector under the tank up near the front. I have had some trouble with the signal from it powering my digital tach. It MAY be a differential voltage on ( ie 12-5v for 7V) that I have encountered before. Haven't determoined that for sure yet.

[the_63]

My bike is a 1999, and the clocks I've got are from a K5. The wiring diagram for the K5 shows that there are 2 more components coming from the ignition control unit, my concern now is that these additional components are essential to the tachometer reading correctly. Plus I still don't know where I need to tap the red/black wire into.


Chris

[gregjet]

My wiring diagrams show the 99 is a mechanical tach. The 05 ( same as mine ) has a wire from the ECU for the tach the 99 does not. You need an aftermarket tach that will pick up the signal from another source if you want electronic ( coil, coil differential or inductor from the spark wire).