Google lead me here through a couple rather old threads that had maybe 1 or 2 comments on the topic; I figure someone or several someones have already done a similar project but the keywords might be off from what I am looking for.
I am buying an older car, 89 Mercury Grand Marquis, that is all original and I want to keep it that way. However these cars came with Idiot lights in the dash rather than gauges and I would like to have some additional monitoring on the Power train. Mainly I am looking for Oil pressure and Coolant temp though once this mod is operational it would be easy to add other functions. I want the system self contained and removal\restorable. The car has a digital clock in the center of the dash like this that I think would be easy to hack, would require no dash modification, and could easily be replaced with the OEM part if need be.
My Idea is to use an Arduino or similar Microprocessor (Pi Zero or a teensy might be more ideal) and drive the OEM LCD to scroll through the clock, Oil pressure, and Coolant temp. I have a basic background and understanding of how to code this and have done projects in the past on a Basic Stamp; I am mostly looking for sample code and recommendations on what hardware to use for this. If you know of a similar project please feel free to comment the link, certainly not looking to rehash a conversation that has probably already happened, just looking for guidance to finished projects.