65 Barracuda daily driver

I noticed the slant was low on oil and, I'm not sure, but it's possible that it's been two years since I last changed the oil. I changed it yesterday, but haven't driven the car yet. At this point I think that a combination of issues cause the stalling/ non-starting. Not being aware that the car is overheating because the temp gauge wiring was bad, old oil leading to overheating combined with poor electrical connections?!