I love this feature on my futaba 10px. I can see everything that my esc sees. I can see the battery voltage so I know how much charger % and run time is left on the car as well as receiver voltage, motor temp, motor rpm, esc temp so much more.

I do t know about sanwa but for my futaba 10px they make a small $30 adapter that one end plugs into my hobbywing esu and the other end plugs into the futaba receiver so I can see all the esc info on the radio

if you look at my picture I sent the larger center gauge to by the cars battery voltage.