Looking for tips on replacing Oil pressure sender

Just worked through engine break in after top end rebuild. 318 LA, '68 Cuda. Got a leak which I think I narrowed down to oil pressure sender. I'm going to take the old one out and replace it. Questions: (1). How exactly does it get connected to the gauge? I rewired the car w/ a Ron Francis Mopar Access 24/7 kit which has a wire for the sender, but I'm not sure how/if the wire gets connected to the sender; (2) is there a better, more modern sender that I can use in place of the old mushroom style? Thanks in advance.