I swapped out the engine in my 84 Blazer a couple weeks ago. The 305 it came with took a crap on me so I put in a late 70s 350. Well none of the sensors from the 84 would transfer over to the new engine. The holes were either plugged and unremovable or just not there. So none of them got hooked up and they just it in the engine compartment now. I got an aftermarket temp sensor, oil pressure, and volt meter because thas all I figured those sensors did. Is there anyone of them thats important and I should work on getting back? I am swapping the engine again for a 350 with much less miles and newer so maybe I will be able to use them. I didn't think things like those would matter because I don't have a computer being as its carbed and manual.