overhead trip meter

Hi all.
I recently found an older aerostar at the wrecker. It was pre 1992. I own one of that year and it was the first year with flush headlights. Anyways, I noticed that this model had an overhead console. It appears to be a trip meter.
I was looking over my Haynes manual and it didn't mention it. (Maybe that because Haynes manuals generally suck!).
I was wondering if anyone knows where I can get a wiring schematic for this thing. I want to mod it and put it in my 88 turbo coupe dash.
I just need to see if it is a possibility mate it to my computer in my car or not
thanks all....