For temp sensor , check the “brown wire” under the dash = use a meter to make sure the wire is not broken along the harness.
For Speed = Signal comes directly from speed sensor on the fork leg, so put your front wheel in the air , spin the wheel fast and see if it comes on?
Or
Remove the plug for speed sensor , check connections and clean contacts. Check the wire colour for speed sensor going to dashboard blue socket, use a meter to verify there is no breaks along the harness (signal loss?) or try another speed sensor.
Fuel Gauge = If you have fuel , the bars will go up yes.
Does “Turn Left, Turn Right, Neutral , High-Beam” work ?