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I must have some oddball gear in my '78 SC 915 tranny, 60mph = 2900RPM in 5th. Speedo has been checked and is true, tach functions properly. Normally runs 3400 RPM on the interstate going with traffic @ 70mph.
To answer 911SC's original guestion you just do the math (as Scott and Seth show). If 3000 = 75 then 6000 = 150, etc.
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