Jaycar Speedo Corrector In R33

[tryingtime]

Hey guys. I've recently converted my Auto R33 Gtst to Manual. The speedo is now reading half of what it should ie at 100kms it reads 50kms.

I have purchased and installed a Speedo Correction Module from Jaycar as per the instructions. On auto detect i am getting a signal in from the speedo sensor noted by the led flashing at 1hz, great. However, when i switch the two pots back to 0 and try to get the cluster to show a speed, all that happens is the needle jumps up to 40kms and stays there irrespective of actual speed. This result is with the AC Coupling jumper installed. If i try the other two jumper settings i get no reading on the cluster.

If anyone has any ideas or has some experience and can shed some light it would be much appreciated.

I am aware of the solder pads on the back of the speedometer but im not sure if they can run out a 50% adjustment.

Im using a manual speedo sensor (longer and has a red gear on it). Using the auto cluster and the auto diff.

Edited August 28, 2014 by tryingtime