Transmission service required ads light and gas gauge drop to zero?

After replacing the front passenger side wheel bearing by s mechanic I drove off slowly and transmission service required light on cluster, call the mechanic and tell him he told me it will go off by itself because he added oil to the transmission I hang up and speeding up on the highway around 80 km/h transmission service required goes on ads light and gas gauge drop to zero the car give knock and drag down like a manual I put the car to neutral on side of the road didn't put it on park left it in neutral but when put in drive it kicked I drove slowly then put the car in park turn off the engine wait about 5 minutes restart and drove slowly to the mechanic avoiding to go over 80km/h + the mechanic change the speed sensor -abs, stop switch did a alignment and it still does the same he unplugged the abs sensor and told me to try it, I didn't try it because it dangerous and the gas gauge doesn't work