barefoot speed

HELP?

Because my m.p.h speed gauges dont work,....Does anybody know how many RPM'S I should barefoot behind? I like to go medium barefoot speed, but I want to tell the driver exactly where to put the RPM guage for consistency....

I weigh 175 lbs.....Any help approximating RPM placement would be helpful....

Thanks.

try 3700 rpm should give you 37 mph if you have a 310 hp motor