I just put a new motor in my truck every thing on the motor is plugged up rite I'm pretty sure, the front bumper, fenders, headlights I left off, I went to turn the key over to see if it had power, everything was dead except the little light on the dash and the air bag light is blinking, would I need to plug in all the little sensors on the front of the truck or what?

 

That computer checks EVERYTHING that could damage ANYTHING before it will let you start. Try to imagine what they were thinking when they wrote the original warranty. You probably don't need everything, but it's going to be darn close.

 

You wont need the front bumper thats for sure.
I drove my truck around with no bumper for a while.