I also had a scare yesterday. I started my Jeep and the oil pressure gauge did not come up. I started the motor again and noticed that none of the valves were ticking and the oil pump was not whining. replaced the sending unit, and everything was fine again. I would also point out that I priced a new pump as well just in case it wasn't the sending unit, it was only $85. That's an awfully big bill for changing a pump. Just my observation.
"Super educated, I'm smarter than Spock"
"If you try to knock, me you'll get mocked
I'll stir fry you in my wok
Your knees'll start shaking and your fingers pop
Like a pinch on the neck from Mr. Spock"