With a stock guage I doubt they would read anywhere near properly. The guage will have a ratio if it is mechanical, which the 400 will have
With cars it is easy you can usually find a different inside gear. On our bikes you either gotta get a guage that is geared for the tire height of the new wheel or get a programmable electric one. The electric usually mounts a magnet in a recessed area on the wheel and you do the simple input of tire sizes in to the guage
