vissiajs

So a supposed shop that does ls swaps did my swap. I have an lq9 being ran by a fast ez efi\ fast xim. In a 92 Silverado, the only guages they could get to work was fuel and battery. They completely cut out the factory harness. From what I can find I'm going to have to get Dakota digital mgi-5/8 to run my tack and speedo. Am I able to wire the therm. And oil pressure direct?