Looking for a complete engine and transmission. Southern California only please.

Last week my car started to read low oil pressure. It would sit between the middle line and low line. Car has oil in it I run 20 50w oil. Some say it can be the oil sending unit? And other said engine is losing compression what can it be?   Has anyone used a Duralast oil sending unit before?   Or where i can find one for the car?

Looking to buy a new, unused NJV head with components if possible. I'll take a bare one if available.

I was hoping someone knows where I can buy a SS clutch line? Or if anyone has one they would like to sell? Thank you!