For the 4.6/4.8 cluster to on 3.0, Fixel can do it.
He will program your vin, so you don't have a tamper dot.
He will vigninize mileage to 0. Once you plug the cluster, cluster will download mileage from LCM/EWS.
He will code your cluster according to your ZCS.
He will also flash your DME to get your oil temperature gauge and RPM rings on the new cluster working.
Then everything will work on M54.

Before you can do that, you need to change the wiring from low to high.

Low clusters have 2 connectors for the cluster, and high cluster have 3.
I've seen lots of diagrams online. I found one guy in France who makes the connector, he charges 300 euros.
I found one guy in Russia who charges 75 euros. However with the current situation, there's probably no way to send money to Russia.

I was thinking of building the connector myself. 300 euros surely seemed overly expensive to me.
But I read on different forums that the wiring diagrams to build connectors from low to high clusters are not 100% accurate.

I'm currently wanting to install 4.8 cluster into my 1998 E39.

I hope someone who actually made a working conversion cable can post the correct diagram that's working 100%.

Then it would be a matter of depinning and repinning the connectors and adding a couple of things like the coolant sensor.