S13 Speedo on S15 Drivetrain

[Z16 Autocross]

So I have an 89 S13 chassis that has a S15 Silvia sr20det engine, S15 6 speed transmission, and S15 differential with S15 VSS. The ECU is also S15. So my understanding is the S15 VSS outputs a Sine wave format signal. Normally this is converted to a square wave signal from 0-10v by the ABS controller and the signal is sent to the ECU. The ECU converts this to a 0-5v signal for the Speedo. I do not have the ABS controller and wish to reuse the S13 digital dash with HUD. Does anyone know where to find a circuit to convert the sine wave to square wave and allow me to vary the output voltage to the ECU? Next question will the S13 Digital Dash read that format or am i better off just going vss to SGI5 to S13 speedo? Any help would be appreciated!

Cheers,
Z16

[KiLLeR2001]

Hmm, you could ask Toby, he had an S15 engine in his S13.

http://zilvia.net/f/off-topic-chat/435932-ask-broadfield.html

[Broadfield]

Or better yet he could hand deliver the answer to you!

You need a Dakota Digital SGI-5... they go for around $80 shipped on the internet.

I'll sell you mine for $50 shipped :naughty:

[Z16 Autocross]

Got one already. My understanding is that modifies frequency and not waveform. Tried wiring that between the VSS and the ECU. Also from the VSS directly to the speedo. Suggestions on how that might work?