I have an 88 750IL. It had the same error message when I purchased it a few months ago. I found the problem was probably poor insulation on one of the wiring harnes'
(also the trans seemed to be stuck in third gear)
due to the price of repairs along with other possible problems I replaced the entire transmission. This seemed to fix the problem. however just yesterday it showed again. just minutes afterwards the display started showing what appeared to be crop circles
![Paranoid [paranoid] [paranoid]](/images/smilies/icon_smile_paranoid.gif)
now my the mileage temp fuel and readout will appear to work for a moment then do something wierd or just cut out. my car is however running and shifting fine so who knows.
![Burnout [burnout] [burnout]](/images/smilies/icon_smile_burnout.gif)