2001 Harley Davidson FXST Softail Standard "speed sensor" Questions

...first? Does it go to the front tire or the rear tire or somewhere else (tranny?). Need your help. Greatly appreciated. Sincerely, Steve your bike uses a speed sensor @ transmission. need to test

...sensor high 93 Historic N/A Check engine light open/low NO CHECK ENGINE LAMP AT KEY ON or CHECK ENGINE LAMP ON CONTINUOUSLY 94 Historic N/A Check engine light high NO CHECK ENGINE LAMP AT KEY ON 95 ...