When I look at this article
https://www.205gtidrivers.com/articles/articles-guides/body-interior-ice/instrument-panel-explained-r46/
this appears to be for the PH1 cluster - blue plastic flexible circuit, mine has the green flexi circuit.
For instance on my yellow block the second pin is for the fuel gauge - in the article fuel gauge is pin 6.
Any ideas what that the first pin is on the instrument yellow block is please? Its a pale blue/pale turquoise wire.