Speedometer Calibration

Needing a speedometer drive gear for my transmission. Running a 93 transmission with a 1.8 swapped 4.1 rearend and 225/50/15 tires. Any thoughts how many teeth my gear will need to have? I have been reading for quite awhile now

http://www.solomiata.com/Drivetrain.html

It will be more accurate than it was before with the 4.3 speedo-gear. I'm not joking.

figured it out

Figured it all out! lock this down