so i was under the impression that the stock mr performance gauges were volts, trans temp, and boost. i was under my car and i saw that my oil drain plug was different, its a temp sender. does this mean that the middle gauge is really and oil temp not trans temp? thanks

 

correct

 

so if i bought stewert warner gauges, do i have to install new wiring, or could the old wiring be used?

 

you could use the power source but the sender needs to to wired to your new gauge...