Originally Posted by drifthappy

Ill post it anyways. S15 cluster into s13

Figuring out how to understand the FSM literally opened the door for me to completely understanding any Nissan. To put simply.. all the circuits in your cluster are 12volt and are complete circuits. You just provide the positive and negative for it at specific pins, which the FSM explains to you!

You have Two pins for power (one constant for the clock, one ignition for the cluster) and one pin for ground. Then, for example, you tap into your left blinker right under your steering wheel for pin 21, then tap into your left blinker for 29, then ground pin 28 to the chassis. And that's it.... you now completed the blinker circuit and have working blinkers/hazards on your cluster.

Believe it or not. The gauges are even easier. The RPM is one wire directly from the ECM (yellow/red). The Fuel gauge is one wire directly from the fuel pump (the green wire). The water temp is one wire directly from the sensor. And lastly, the speed is also directly from the ECM, but I couldn't wire this one since I don't have the ABS system or the VSS.

I used the terminals from a ECCS harness. So slice one up and take a bunch of wires out of it. Then start making your own harness. What's so awesome is that... I probably only wired in.... 15-20 wires to the cluster to get only what I needed to work (rpm, gas, w. temp, blinkers, high beam, hand brake, check engine, oil pressure, gauge illumination, and air bag. If you don't ground the air bag terminal, the air bag light will stay on forever.). There are 64 pins, half of which aren't used unless you have the Hicas system for example, or an Automatic tranny. Last, advice. You should have about five ground wires coming out of the cluster, it's important that you ground each wire seperately, at least an inch apart. The current could travel backwards in the wire and short a circuit (don't worry though, there are diodes built in to the circuit board to protect it from damage).