which is better electric or mechanical guages for boost and oil pressure

"Boost"- - - - Electrial or Mechanical doesnt really matter only thing that passes thru is AIR. (Mechanical less wires)

"Oil" DEF ELECTRICAL. . . unless u want OIL passing all the way into your cabin. Imagine if line slipped or if OIL started coming thru it. that would suck huh???

Yeah for oil go with electric. Mechanical gauges are more accurate, but I wouldn't want oil coming into the cabin of my car.

both do the job but electric is easier to fit and cleaner

just run steel braided line and make sure you seal the threads with teflon tape, ive had it for years like that and no problem...