By my calculations, a 22-tooth driven gear would have been ideal for this configuration. But, my options were a 21 or 23-tooth driven gear. As best I can tell, a 22-tooth driven gear for my TKO style drive gear does not exist. I opted for a 21-tooth driven gear. Using my 'calibrated' phone app speedometer, the GS speedometer reading is very close to actual speed (+/- 1mph).
Tremec TKO 600 Drive Gear is 7 teeth (Yellow)
65 GS Calculation: (7 x 4.11 x 775)/1001 = 22.27 driven gear