Used a couple of Diamond Group LDSDIM25 Pulse Wave LED Dimmers purchased from Amazon for around $50.00 each. Be sure and only use the Diamond brand and not the JR Products being the JR Products didn't work with the LED lights. On our coach each overhead has it's own switch on the wall next to the bed, my wife's side had a double switch but she didn't care for the other light being controlled by the second switch. The dimmer requires a space equal to a double switch so I just eliminated the other light. On my side there was only a single switch so I had to elongate the existing switch to accommodate the new dimmer. LED light will only work with the correct polarity if reversed they will not work. I had major issues getting my side to work originally but finally figured out that the factory put the original switch on the negative wire where it needs to be on the positive wire, once corrected it worked great.
Here is a link to the Amazon page :
https://www.amazon.com/Diamond-Group-LDSDIM25-Pulse-Dimmer/dp/B0136U60KE
For a picture of the switch here is a link to Camping World but they are about $10.00 more plus shipping:
http://www.campingworld.com/shopping/item/led-strip-lighting-light-dimmer-black/77564
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