I've got a '67 b-body with an AutoGuage mechanical mounted on my dash @ my 2 o'clock, right next to the tach. Like to keep an eye on the numbers w/o having to look under the dash and taking eyes of the road. I used copper line with a coil, wrapped in a rubber hose to protect from vibration where it comes through the firewall. I installed it on the car 20 years ago when I got it running. I like analog b/c one time the idiot oil light winked on. Looked at the mechanical still had 40-45psi. Come to find out the wire on the electric sensor had worked loose. Just re-attached loose wire.