Not exactly making your gauge work “like the real thing”, but removing one factory gauge and fitting an aftermarket digital gauge that looks aftermarket.
Likely a £50 Ebay gauge and £20-30 worth of fittings. He’s saved time on figuring how to wire up a standard aftermarket multifunction gauge plus found one that fits. But it doesn’t sound reversible, but I don’t know if that is important to you. At $199, it got to be using a cheap gauge. How long they last for, and then when they pack up, what are your options, I don’t know.
This does more, though I’m not sure it integrates into the cluster though:
The photos are a little contradictary
But seems more easily reversible, because its picking measurements the car is already making.
A thread on this Rotary product: