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Before we get into it, I have been searching the entire Internet and the R34 manual for the past week without much luck. Now, here is the problem. I have a R34 GT which came with a RB26 engine setup for RWD. It also came with the RB26 loom and ECU. This Everything worked well along with the R33 gearbox. After building the RB26, I decided to swap the motor with a RB25det NEO engine, gearbox, loom and ECU. Yes, this is when the speedo stopped working. I have traced the issue down to the TCS/ABS ecu as the GT (NA) ECU does not have TCS but the GTT ECU is now looking for a signal from the TCS. Here is what I have tried so far... 1. Run a wire from the speed sensor in the gearbox to the cluster and ECU 2. tested for continuity between ABS computer and cluster (speed signal wire) - all ok 3. tried a second hand cluster that was working at the time 4. used self diagnostics and got the following codes (26 - 44 - 46 ) 2 of them related to TCS/ABS The golden question is How can I get my speedo to work again???