1996 Chevrolet K1500 "training wheels wont fit" Questions

hi can changeing the turbo on my expert 20L hdi cause black smoke 52 plate thats what i was told ? no i dont think so ,more than likely its ERG valve ,thats the valve that open and allows exhaust gas ...

...fit their exact slot). Is there a certain area or part I should be looking at to be causing this issue or has changing the gauge cluster effected the start up ability in some way? is there a ...