Hi I have an odometer memory question. Where is the odometer memory stored ? Is it in the little mother board behind the LCD Speedometer or is it in the PGM IV it's self ?

The reason I am asking is my LCD display was blank when I received my bike after shipping on a container Ship. I saw pictures of the kms on the LCD and my bill of sale said 9712 km but after I purchased a replacement LCD Speedometer/Tachometer from a salvaged bike in Japan when I put it on my kms now show way higher than 9712.
Do I just need to find a replacement LCD Speedometer/Tachometer that has closer km to what I am supposed to have purchased or is the Odometer memory inside the PGM IV and I have been misrepresented on the km on this bike ?
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1986 NS400R NC19
1986 NSR250R MC16
1996 NSR250R SE MC28
1994 VFR400R NC30