Even better for AC. I like the Calterm brand with the LED in it. Mounts in a round hole. I use a diode 1N4003 from earth to common to protect the LED. Even though they say 12 vdc, the half wave rectified 18 vac has an RMS value of about 12.7 v RMS. So they work fine. If you have a bank of them, you can connect all the Earth terminals together and use one diode to common ac.
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