What signals does the REV counter use to function properly?

Hi,

I have a B8 3.2 FSI V6 Quattro that ceased.

After searching for a engine in SA I had no choice but to do a conversion.

The car just broke 100k KLM.
So we fitted a Chev 5.7 V8 to the ZF 6HP28 Quattro Transmission.

So far all is fine and working BUT the Rev counter is not responding correctly.

We have tried everything...
* Original engine speed trigger wheel and sensor.

* 60-2 trigger with hall sensor

* Signal generators

Nothing the Rev counter just shivers and the ecu disconnects it...

My question is:

What all does the ECU require to to display the engine speed?

See Youtube link what it does 👇🏻

https://youtube.com/shorts/55OgrD6v4eo?feature=share

This is the only thing stopping us from finishing the project...

Please help me🙏🏻