I have a similar problem to Taffys with a Series 1 Aero, mileage reading displays only at random times and often flickers.
Just to add to my earlier point above, having spoken to Brian Miller today, he said that it is fixable on both the Aero S1 and trads using those VDO units. The unit has to removed and sent away for repair and the memory of mileage is not lost. Sounds encouraging to what seems a common problem from cars of that era.
