Oil pressure not registering on Dakota digital gauge.

not very familiar with 3rd Gen hemis. yes, there is an auto shutdown program in all factory late model efi stuff. where does the Dakota oil pressure gauge read from? Is it mechanical or electric? isn't there a tapped pipe fitting hole for a sender or oil line? if so, why can't you plumb in a tee, and run a mechanical gauge directly there?
This is a electrical gauge , and it takes its reading from the computer obd2 port. Was thinking about trying a mechanical gauge at sending unit hole. Just there not much room where it’s located.