How to wire hall sensor to work with Nissan 240sx OEM speedometer

Hi guys, i have a 1jz/r154 with an ECUmaster EMU and I'm trying to get the speedometer to work on a Nissan 240sx s13 OEM cluster.

My question is to do with the speed sensor signal:

Originally, the speedometer takes the VR speed sensor signal and outputs a square wave to the ECU. The speed sensor in the 1jz is a Hall sensor and is wired directly to the ECU instead of through the cluster. The output then comes from the ECU to the speedometer and can only be a square wave. Im wondering what I can do to resolve this (Ie: some kind of square wave to sin wave convertor) and how to wire it into the cluster (ie: what can I omit from the factory inputs to the speedo - do I still need pin 28 and 24?)

The original inputs/outputs to the factory speedometer (without heads up display):

- ground - pin 28,

- Switched voltage - pin 24,

- signal from VR sensor - pin 6,

- Signal ground on VR sensor - pin 12,

- square wave signal to ECU - pin 7

Someone give me some advice! I heard it is possible to use a RC circuit to convert square to sine but it would only work for 1 frequency, not the whole range.. not sure what the solution is to that.

Factory speedo wiring picture below, hope its clear. Thanks in advance!

Might just be easier to fit a VR sensor compatible with the Speedometer.

I have successfully driven a skyline speedo using a simple decoupling circuit to create an AC like signal that will cross zero from a squarewave. This circuit will be affected by other factors in the circuit such as the pull-up on the output and impedance of the speedo etc (note our ECU outputs a low side drive square wave pulled up to 12V with 1.5kohm).

https://forums.linkecu.com/topic/11516-g4-speedo/?do=findComment&comment=74473

Interesting, thanks for the responses. So a follow-up question:

The original VSS circuit shows that both the wires from the 2-wire VR VSS go to the speedometer.

The output signal from the ECU I assume would need to be grounded to chassis if it is a 12V output as you say?

If I manage to convert the output signal from the ECU to an AC sine wave, I would supply the speedo with this signal, and ground the other wire?

Thanks in advance! I'm sure this is an elementary question but I'm finding difficultly finding a clear answer.

Measure both sensor wires with an ohmmeter connected to ground, I think you will find one of the wires has continuity to ground.