i decided to change my tranny fluid to gm synchromesh FM today since i grind in 3rd and slightly in 4th gear at high rpms. I took off the speed sensor to fill my transmission so that it would be easier to fill, but once i re-attached it after i was finishd i drove my car and i noticed that my speedometer wasn't working. any inputs on diagnosing this problem?
also i forgot to state that i have a y21 hydo tranny and p28 reprogamed ecu in a b16 sir2

 

nvm fixed the problem