Are there any write-ups regarding the stock 740 wiring mess and how to install an aftermarket head unit using the factory harness, Volvo amp and Volvo EQ 611?

I read the whole thing on BrickBoard regarding doing this with to a 940. It is not the same for my car and I do not know anything about electronics. There are no photos at all.

So if anyone knows of such a write-up I would be most obliged for a link.

Thanks!

Wade