I want to install a bi-polar (Red/Green) LED with a Tortoise switch machine. Since the Tortoise requires voltage, positive or negative, to be supplied continuously to keep it in position, wiring the LED in series in one leg should show red or green depending on polarity. Also wouldn't the internal resistance of the Tortoise protect the LED from over-current? Or should I wire the LED in parallel with the Tortoise, and with a resistor to protect it? Is my thinking correct? Has anyone done this? Thanks.