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I've bought a mk3.5 cluster for my mk3 vr6 (just like the red needle) + new screens installed :)
 

Now everything works apart from the temp gauge 

I swapped it back around with my old ones to see if it's the wiring but no as thwy work fine 

I've tried everything

 

Please help as I've looked everywhere! Thank you 

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To confirm: the temperature gauge works on your old cluster, but doesn't on the new cluster?

 

I think the temperature is supplied by the Yellow 4-pin sensor on the thermostat housing (the Blue 2-pin sensor tells the ECU the temperature).

If you have a multi-meter, measure the resistance across pins 2 - 3. Low values (around 30 Ohms) indicate hot and higher values (around 260 Ohms) mean cold.

Guage and Instrument Testing with Special Tool VW 1301 (bentleypublishers.com)

 

You could put a paper clip (or similar) across the pins 2 & 3 and see if the temperature gauge moves to HOT.

But if the gauge works on your old cluster, the temperature gauge on the new cluster is faulty.

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