No oil pressure when I started the car.
 

I have a 99 Firebird V6 100k miles. I started the car and the oil pressure gauge did not move. I jumped out and checked the oil. Little low but looked fine. I rolled down the driveway and there is a puddle of oil. Did something pop out all of the sudden? Sending unit leaking or what? I haven't had a chance to get under it yet. It looks like it is leaking at the back of the passenger side head or lower than the head straight down. Car has not had any motor noises or issues so far since I have had it.

could be the sending unit....

I will check that Saturday. Is there any other things that might leak besides oil pan head gasket or hole in the block?

The problem was the oil sensor switch. $29 and my 1 1/8 wrench to fix it....