Drive pressure gauge... Mechanical or electric?

I'm looking into getting a drive pressure gauge and tried searching for some insight on what would be the better choice to go with, mechanical or electric, and the downfalls of each. Wanted to get some opinions from members that either have ran one or are running one. I'm looking more towards the reliability factor. The electric gauge is almost $100 more but I'd go that route if I only have to buy it once. TIA.





I like to go fast