I cannot figure this out please help
 

Hello I owe a 2007 Silverado 1500 (new body style) it has just under 200k and I bought it used, now in the last couple of months it has had some normal repairs that needed to be done and now there is some issues I cannot figure out, all at the same time the oil pressure gauge quit working (lot of oil and running fine). second is the cruise control stopped working, and thirdly the Active fuel managment system is not working, also I do have a service engine light on and it is the code for the throttle positioning sensor (throttle body needs to be cleaned). I have checked fuses and looked for shorted wires, is there anything I could be missing?

try cleaning all grounds