Carl that is exactly what I did.
The LPF was fine in the 4WD but I wanted to get another Speed Passion speedo and it made sense to get the Pro for the ZX5-FS and put the LPF into the RB5.
Neither speedo has given me any trouble (other than of my own making when I flashed the firmwear badly on the PRO ... ooopppsss).
Speed Pasion V3.0 motors are the dogs danglies too
