[PeteA216]

Yep, when I got the 9C1 speedo for my '84 it read 160k when my car really had 84k, so I took apart the speedometer unit making careful notes to myself of how all the little parts went together until I got the odometer cylinder out. I rearragned the numbers to match the original odometer from my caprice right down to the tenth of a mile. It'd be even easier to go back to zero, but I wanted accuracy. I changed this the same time I changed the motor, so I can always look back to the original speedo to see what the mileage was at the time of the engine swap.