02 dodge ram 2500 cummins the tach don't work and camshaft positioning sensor code?

i have an 02 dodge ram with the 5.9 Cummins diesel engine. it is throwing the camshaft positioning sensor code and the tach won't work. i replaced the sensor(PAIN IN THE ASS 2 DO) and i still get the code and the tach still don't work.what is the problem and if it is the tach is there a way i can do a gage sweep test?
 
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