I've been looking at quite a few pictures of gauge cluster PCBs, but I've been unable to discerne what is actually powering the board.
An MCU is a Microcontroller Unit. It's basically like your CPU in your computer. The most common types are 8bit. But can be of any type (8, 16, 32, 64bit) with varying types of architectures. I really don't see a 1995 vehicle requiring much processing power, and would assume it's an 8bit MCU, probably from an OEM supplier like Bosch or similar with a core like that of an ARM or Atmel variety.
The big square thing in the middle is the MCU.
Edit: The image is from Toby Erkson's page at aircooled nut.
If anyone is able to look at the chip(s) and give me a listing of what is written on the chip. That would be great. Also, if you're aware of any JTAG or debug ports on the board. That would also be helpful.
Additionally. I do not have a Bentley, but if anyone has a wiring diagram of what wires go from the Cluster to the ECU, Circuit Block.
PS: I know I could take my OBD1 cluster apart, but right now my car is perfectly stock and functional, and I don't want to experiment on it directly.