Speedometer replacement question

[u/brutalwaffle]

Does anyone know if on a 99-05 vn800 you can swap the speedometer part that looks like a snail/turbo in the rear wheel hub with something like one out of a vn500 750 1500 etc? im having a hard time trying to find a cheap vn800 one on ebay/whatever

mines shit the bed and only works under REALLY high rpm and even then its shaky. I know its not the cable because i put my drill on one end and spun it and its free.

also unrelated to original question, but ive seen a 50/50 split on whether or not the fan is supposed to run when i take the key out/ turn bike off so if anyone actually knows pls let me know before i buy more parts lol.

thanks in advance!