Is this mainly a summary of what has been posted here:
https://www.aeu86.org/viewtopic/digital-dash/t/4981

Credits should go to: evfan42, faka_watt and RoninMax

If you want to install one you need to modify the following:

• digital oil pressure switch (one of a EP71,82,91/SW20/AE92/ST16x will do.)

• digital fuel sender (part# 83320-19725)

Replace the analog oil pressure sensor with a oil pressure switch and replace the fuel sender with the digital one.

Then you need to modify your wiring loom (RHD cars):

Keep in mind that the

You can find this in an excel file here as well:
https://www.aeu86.org/viewtopic/ae86/p/74133#74133

I assume after this you can use your digital cluster. If not: please let us know!