Least Shoddy Fuel Sending Unit?

OK to be more exact... Starts ranged from 4.88 to 5.02. after 10 minutes 5.02 to 5.42. All with no load on output, just run to test before packaging. The prototypes ran in my 67 and our 73 for 18 months before the 1st retail unit went to market. I shipped over 360 units during 8 years. I know of only 3 field failures. The resistance of anything and everything changes with temperature. I'm not the electrics wiz though, my brother is.

Ok, that makes sense, the 7805 also acts poorly with no load. Obviously worked fine when installed