oil pressure and sending unit.

[j.rigby15r]

Alright so I was tinkering with my 64 and the 350 under her hood. And got curious about oil pressure and all that stuff. I currently am using the stock mechanical oil pressure gauge. I had to replace the copper line with some nylon plastic tube from the block to the wall. At idol I get about 30 psi and usually 60 or more while driving. I feel this is good especially since if I have my valve covers of the oil shoots from the push rods all the way to the fender. Am I right in my assuming? Also I've been reading about oil pressure sending unit, do I have to have one with a mechanical gauge? If so why or why not?