I've lost more then 2 mechanical oil pressure gauge lines before. One was plastic, the other one was copper. I still have a mechanical OP gauge to put on stuff that came with just the lights to see what the pressure is.

The new gauges I bought for my truck are full electrical Speed Hut Gauges www.speedhut.com and they came with the gauge, the sending unit, and the wires to the sending unit. Their gauges are made to order in the USA, it takes about a month after you order before you get them. Not cheap, but nice stuff. Gene