[Elbert]

Get the right type "socket" to remove the pipe plug in the RH head. I would only attempt to remove that plug as a last resort, becuase they generally are hell to get out.

How did the sending unit in the drivers side head "break off"? Is there no "nut" left on the sending unit in which to use a socket to remove? Generally you have reasonable access to the drivers side head. I would imagine there is a way to get it out.

If the truck is a TBI engine you don't have to many other options. You can atteempt to remove the pipe plug in the RH head, but I would avoid messing with that, especially with the engine in the truck.