Speedo cable with Columbia overdrive

[ford38v8]

Originally Posted by glennpm

But then the speedometer would indicate a slower speedometer speed with the OD engaged.

The only way I can see to do it would bee to have a special axle with a gear on it to drive the turtle.

I said final drive, you said axle. I think we’re on the same page with that, right?
And about fluctuation going around turns? I think I’d rather have a tach than a speedo if I was going to race in a roundy round! 😎