It's the green wire on the back of the cluster.
It will come from the EDIS module in the engine bay if you car has an
EDIS module or direct from the ecu if it's a later one without the EDIS
module.
Some of your troubles swapping clusters may be down the the fact that
there are differences in the rev counter for the different engines and
the rev counter will read half or double the correct speed if it's not
the correct one for the engine.
Was the car build with the SI Zetec engine or has it been upgraded from
a CVH ?
If the car originally had a CVH the green rev counter wire is actually
tapped off from one of the ignition coil wires inside the loom.
Jim
On 07/10/2016 18:26, bilje55 wrote:
I've tried several different instrument clusters in my car, all of
which have had one fault or another, but the most persistent and
irritating problem is the current unwell rev-counter. I think the
instrument itself is OK as the needle move quite energetically when I
engage the starter to fire up, but it then returns to base and stays
there. It's a standard Mk3 Si loom with a single multiplug connection
to the rear of the cluster. The speedo is mechanical. Out of sheer
frustration I had my local garage spend time with it today, to no
avail. It would help to know which of the wires in the multiplug feeds
the tacho, where this feed comes from and any other helpful
suggestions would also be very welcome.
Bill
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