As far as the gauge cluster goes, it is held back by an electrical cable, the oil pressure line, and the speedo cable. Each one will have to be dealt with before you can completely remove the cluster. Do some searches here and you will find many answers to these problems in previous postings.

'87s may have an electric speedo, so there may only be two things holding it back.

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1961 190Db retired
1968 220D/8 325,000
1983 300D 164,150