I'm in the middle of a rebuild
right now. None of the scraping and so forth worked for me. I ordered a replacement LCD from www.akspeedo.com
that comes with the ribbon cable installed for 25GBP including postage. The part arrived in about a week from UK to Boston. It worked as described. I did need to supply my own double sided tape to reapply the LCD display.
My only problem is that somehow I managed to blow out both dash lamps which I really don't understand. I have a 12V power supply so definitely didn't provide too much power. I haven't been able to track down replacement incandescent bulbs (T5 wedge, 1.2W). I found some LED versions here (https://www.superbrightleds.com
part:194-R-120: Red 120 Degree). I am worried they will be too bright. They just arrived Monday but I've been preoccupied. LEDs are all I can find new. There may be a busted VDO gauge on EBAY to get parts
from if the LEDs are too bright. I hope to finish installing them and doing a bench test.