engine light came on and speedometer stopped working.

What is your question?

my service engine light was on because it needed an oil chanege, before I hadmy oil changed I changed my brake pads and roters on front and pads on back I also changed all four tires and wheels so the tire pressure light came on. I hooked up my plow and then a couple days later I drove the truck and the yellow engine light came the brake light came on and the speedometer stopped working. I unplugged theplow but it may no difference