Waz1

Shine a torch through the SLIP and TCS OFF bulb sockets in the Nismo cluster, if you can see the warning lights its a TCS and ABS cluster and because you have an ABS shell you will need to run a dedicated wire from a gearbox speed sensor to the cluster.

Noble, I've had this exact issue as you the last two weeks and Ive found heaps of people with the same problem on the forums but never a solution. After heaps of trial and error, Ive worked out why some people can do cluster swaps in 34s and they will work and some can't. Ill start by laying out how the speed sensor systems work in 34s. They are unlike any other skyline. It all depends whether the base shell was ABS only, or ABS and TCS equipped, whether the car is a GTT, GTV or GT base doesnt matter. Starting with an ABS only car. The car has three speed signals, one in the diff nose, and two in the front, one for each front wheel. These sensors are used for the ABS system, and the speed signal. All three wheel speed signals are fed into the ABS ECU, a small black box that is under the glovebox area on the passenger side. This box modulates the signals from a raw sawtooth wave to a square wave, and then feeds that modulated square wave signal to the dash cluster for a speed reading. In this case the cluster expects a modulated square wave signal, and cant read any other signal. Moving to a TCS and ABS equipped car. In this instance there are 5 speed sensors. Four are for the TCS and ABS system: one on each front wheel and two in the diff. All four of these signals are fed into the TCS and ABS ECU which is in the boot now. These sensors are dedicated to the TCS and ABS system only. The fifth sensor is a dedicated speed sensor that is on the gearbox. This sensor sends a raw modulated sawtooth signal straight to the cluster. In this case the cluster expects a raw sawtooth signal. The issue comes when you try to swap a ABS and TCS cluster to an ABS only car, or vice versa. The cluster speedo wont be able to read the signal it is receiving. My guess is the Nismo cluster you have is for a ABS and TCS equiped car, and you have an ABS only shell. To solve your issue, find a speed sensor that fits your box and run the wiring direct from the speed sensor to the cluster to bypass the ABS box. The brown wire coming out of the sensor goes to pin 19 on the back of the cluster, and the black wire goes to chassis ground. If the issue is the other way round, and the cluster is an ABS only cluster and the shell is a TCS and ABS shell, its a bit harder. You need to source a front ABS only ECU, find the wiring diagram to power it up and run the speed sensor wires to it, and run the modulated output to the dash. More of a pain than anything, I would suggest grabbing a different cluster that is compatible. Hope this helped.