Sportster KMH per 1000RPM

[Marks-Sportster]

Here's a technical question but specific to Sortsters so I hope I have posted it in the right place!

I am keen to buy a tacho kit although for the present time I cannot pick the revs of the bike (all based on "feel" like a good v-twin should be). I am curious though, what the speed is per 1000rpm in top gear. A number of factors need to be considered:

-My bike is a 1998 XL883
-Have the ratios/revs changed over the years since belt drive commenced?
-Do 883/1200 have the same final drive ratio?
-Is the final drive 1:1?
-How accurate are Harley speedo's?

If anyone can give me the figures in mph I can easily convert it to kmh!

 

[Marks-Sportster]

Thanks Hobbit, you have answered some of my question, if solid mounts had a different ratio then someone with the same vintage will probably only be able to give me a definitive answer. Cheers mate!