Sensor Upgrades are described in the SR5 core. Anything else you'd have to wait for Rigger V, or temporarily houserule something from Arsenal and hope it will be in Rigger V.
Pilot upgrades you can forget about, the SR4 mechanic wouldn't work in the different SR5 system for devices. Speed upgrades and acceleration upgrades were based on the SR4 system, since Speed and Accel changed significantly they wouldn't translate well to SR5. Handling also was different in SR4 than in SR5, back then it was a dicepool modifier, now it's a limit, but the SR4 mods could still be houseruled. Seating can easily be converted (Squatter doubles the size). Body cannot be upgraded. Armor upgrades can easily be houserule-converted for now.
So sensors already exists, handling, seating and armor you could convert with houserules, Stolen Souls has some other stuff in it, but all the other vehicle attributes you can forget about for now.