I very recently purchased a used but very clean instrument cluster for my 1991 300SL. It was said by the seller to be from a 1991 300SL. The connectors on the back appear to be the same as those on my original cluster.

When I started to disassemble it to install my old odometer, I found the internal structure to be completely different from my original instrument cluster. it even has an electronic odometer!

I would like to know if this cluster that I purchased will operate correctly in a '91 300SL. The part numbers are:
MB 129 540 71 48 and
VDO 110.008.597/030

Thank you for any advice.