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I agree, I would never run tubing into the cab. I picked up a nice 3 gauge electrical gauge set from Summit Racing ($120) and an A pillar pod. Installed last month, pretty straightforward. Gauges are accurate (checked with mechanical gauges) and have a cool blue backlight.
No it doesn't have to but you will have a "dead gauge". Doesnt hurt anything though.
I have all electric gauges and have a T to run my stock sender and my electric sender.
I personally would never run an oil or fuel line into my truck.
I put in the mechanical and it has been a pain in the butt so I am taking it out and putting back in the original sending unit. It constantly finds a way to leak and have to get behind the dash and tighten it or it leaks from the block area. I am sick of it for sure,