That's because the tach is typically controlled by the distrubutor RPM (or cam RPM via cam sensors in OHC engines) or ignition coil, not always the crank RPM.

 

PROBLEM SOLVED!!!! Unfortunately!!!
So the problem was the crankshaft position sensor. although i did have fuel at the fuel rail (which only proves the fuel pump works) the injectors were not firing (Thank you for that info DJ Hellfire) so I finally got it to turn over and act like it wants to start but I got the biggie, the flywheel broke and that is what broke the crankshaft position sensor

Thank you everyone for the input!!!!!!!

 

If your tach did not move while cranking then the crankshaft sensor would not be working properly

 

Not in every case! I'm not sure specifically on Dodge, or the 5.9, but like I mentioned, the tach isn't always controlled by the crank signal. It can be controlled by the distributor or ignition coil, which would allow the tach to still work properly in the event of a bad crank sensor. So unless you know specifically how the system in front of you works, you cannot rely on a working tach to rule out a bad crank sensor. You need to actually view crank sensor activity on a scanner or by probing it with a multimeter. Glad you got it solved. Sucks about your flywheel though!

 

In these trucks it's the crank sensor that controls the tach. That's why I said that mine moves while cranking so the op would realize that he didn't need an obd reader to see if it was working or not.