What and where do the batteries go for the instrument panel on a 1989 535iA. What kind or type of RS battery can I use to replace what's in there? Btw, the problem is that my mileage display is blank. Is the problem bad rechargeable batteries? TIA, Tomas S. Perez tsperez@domain.elided 89 535iA 93 325is 94 540iA ------------------------------