00 ram 5.9 cummins no start

I found 3 codes for the crank sensor, 3 codes for the injector pump, 2 codes for fuel pump, 1 code for no communication to ecm.
I erased the codes and the fuel pump codes came back.
I swapped the fuel pump relay with the high beam relay and the codes went away. It cranks and wont start. I looked at the values with my scan tool and there is no rpm displayed when cranking and the tach does not move. I was wondering if people know if crank sensors are a common issue with theese? Also is the crank sensor the one on the back of the timing chain cover?

(dealer said the truck needed a lift pump and injector pump, go figure. I have never seen an injector pump go bad unless its run with gasoline)

.......INJECTOR PUMP......I just change 2 in the past week....usually the lift pump, goes bad and the lack of fuel causes a premature failure of the injector pump....