Need help again; new sprocket choice

[Ghost-Flame]

started looking at sprockets on the net today. I am replacing both front and rear. all of them have at least 4 options for teeth count. what is the stock teeth count for my dohc cb750C? does it matter? I want to keep the speedo true. any brand suggestions.? Any advantages to changing from stock?

[Piute]

         
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[Re-run]

Piute, did you learn a new language?

Well, my manual says it is a 15/38 setup. 15F 38R

[shinyribs]

... my thoughts exactly. Piute,you took the words right out of my mouth

[Ghost-Flame]

Oh yeah the manual... who would ever think of looking in there, HMMMM.
While looking for tach and speedo I found a spec list, on-line, from days of old that said that 1980 cb750c had an 18/43 set up. I'll check my manual.

What about speedo? our bikes have cable driven speedo, the aftermarket ones I am finding are electronic. Is there someplace on the bike that the electrical one can plug/splice into? That would be nice cuz it would eliminate one cable hanging of the front end and give me options to clean up the dash.