[Second Series]

20.76*60= 1,245.6rpm
The Makita driver is the correct range for the speedometer driver.

How to derive vehicle speed from motor speed:
(1000rpm/30)=33.3rpm, so (1000rpm/33.3rpm)=30 take this result and divide into 60mph:
(60mph/30)=2mph
Let’s look at our test results:
The Makita Slow:
(1000rpm/30.87rpm)=32.39 and (60mph/32.39)=1.85mph
The Makita Fast:
(1000rpm/1,245.6rpm)=0.80 and (60mph/0.80)=75mph

The Makita driver is a work tool, so I went to the second hand store to find a good deal on a cordless driver.
I found a Chicago Electric driver. I extracted the motor, but it was too fast. I put the planetary gear back on and that got it in the ball park.
Chicago Electric w/Planetary Gear: