programer killed my mpg display
 

is there any way to make my mpg on my information center work with an aftermarket fuel coltrol module 99 24v cummins

What programmer did you do. And what do you mean killed? Stopped working, or just dropped in mileage.

its a van aanaken smartbox r i just get an err message when i click to avg mpg or dte

Does your lie-o-meter work with the module off?

I cant turn it off
 

It is wired in I actually had to unhook the stock part and the box took the place of it but it worked before

Hmm not sure haven't had much experience with Van modules. I would send it back and see if it does the same thing with a new one.