Hi guys,

I have a Mazda Speed diff that has thrown my speedo out by about 20Km at 100Km/h (sorry for the metric measure) So I have brought a electric speedo correction kit.

Basicly what it does is takes the pulses from the signal and slows it down/speeds it up alowing you to adjust the speedo.

Now that all fine. I have tried to install the kit onto the 3A wire to the instrument cluster with no luck. It still displays the incorrect speed and the adjustment does not work.

How does this sensor work and will which of the wires matter? IE 3A or 3C?

I thought that this sensor works by creating a voltage but which wire does the dash use to turn this into a pulse signal?

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Sorry to drag this back up again, but Ive been looking everywhere for some information on this.

I have basicly run out of places to look to find out how these sensors work. The diagram looks like both the wires from the sensor run into the gauge cluster and this then somehow tuns this signal into a pulse for the speedo. I havnt pulled the cluster apart to find out if there is an individual with that runs into the speedo gauge itself from some part of the cluster, but that will be my next move if I cant find any info on here.

Has anyone managed to have their speedo adjusted on an FD? and if so, how?

 

if the sensor works by creating voltage that would mean that the other wire is a more or less a ground see if a voltage meter will tell you which is which
if the sensor acts like like the crank position sensors use a volt meter to see which one has constant power and which one only gets power when your moving.