I am trying to modify mileage on a 2003 audi a6 vdo using clip on 93c86 eeprom using tacho universal.I checked the wires,and the adapter board are both good.However when I clip on the clip tacho universal is unable to read the actual mileage.I reads a different mileage which is incorrect.Also when i select read eeprom and show it is all zero's.I have tried doing another eeprom using the same clip with same results.Which leads me to believe the clip does not have a good contact or the port on the tacho universal which the adapter attaches to is no good or has a short somewhere.Anyone has had the same problem???The clip is brand new from pomona.All 3 crystals are shorted.i am still unable to read the eeprom and edit it in circuit.Any one have a fix for this and could tell me what the issue is i would appreciate it.