There is a speed and gph reading on the main (custom) screen, if speed goes to zero while the car is moving, it does not have a speed signal.
The kill switch died in my saturn, so I have to use the key for now. I turn it off just long enough to stop the engine, but turn the ignition right back on so I get the speed signal back and can track distance a little more accurately. I should just fix the kill switch on the shifter though