So I decided this would be an easy enough task with little working knowledge on vehicles. turns out it wasnt as easy as i thought. in order to get to the oil pressure sending unit you have to remove the distributor from its place to get to it. i struggled trying to get the distributor off so i sort of gave up on the idea and tried to reclip and button it back up to how it was before. I tried to start my truck, however it wont start now and i have a check engine light on now.