1) I have never heard of nor had an oil press sensor go bad (Mine has been through 5 different cars over a period o 4 years lol, As long as its mounted on a flex line you should be fine.
2) You do not have to run a britile plastic line from your engine bay into your car and risk oil spillage if it gets cold and britile, or pinched for whatever reason.
3)I feel the Electrical gauge is more accurate.
4)Eletrical is Way Easier to install.
5)The one time use compression fittings on mechanical gauges are sometimes hard to find, If you move the gauge or ever have to un hook it, you have to buy new fittings.
5)Even if for some reason a sending unit goes bad if you hook it up properly you should still have your stock oil press sensor T'd into the flexline.
To each there own. I just think 90% of the people that have ran both on here will back me on this one. But I have been watching the build thread and hope this turns out good.
What kind of tires are you going to be running? I would recomend keeping the Ls mesh or if you can fit 13 inch steelie on there and run an ET street in the front. As long as you have something with some side wall, And coilovers are a must but that should get you hooking quite nice