Iv'e read the posts on fitting a new sender but for the avoidance of doubt is the correct procedure as follows:- When standing at the back of the bus and looking towards the front the sender arm should be in the tank at 3 o'clock and then turned clockwise to the 6 o'clock position. Thanks for looking.
IIRC there is only one way it will fit because of the narrower slot. Have senders have changed to cause this confusion, IDK?
Done a tracing of the opening in the fuel tank and it looks like the sender will be placed in at about 10 o'clock and then turned anticlockwise to lock at 9 o'clock. Thanks for advice