We are swapping out the OEM Blaupunk Cassette Radio and replaing it with a more modern music streaming, Bluetooth device. Cannot get power to the machine directly and have had to take power off the fusebox somewhere. But reading various threads on other fora it seems more complicated than that.

Does anyone have any definitive advice about this swap out? We have bought an aerial adaptor and an ISO adapater (not certain if we have the right one though despite Halfords protestations...) but I was hoping for something more plug and play......