I have installed two kinds of conversions: one replaces just the fluorescent bulbs in the original sockets and the other consists of strips that mount with double sided tape.
It is best in both cases to clip the wires to the ballasts to insure that there isn't any parasitic current drain from that source. Both conversions required attaching wires to the power and ground near the switch on the end of the fixture using included tap connectors. Both conversions took about 15 minutes and were equally easy.
I don't know about dimming: I'm just glad that the conversions are brighter than the tubes and come on instantly in the coldest conditions.
The strip conversion cost about $50/light while the bulb conversion (available at the Airstream store) cost about $60/light.
John W. Irwin
2018 Interstate GT, "Sabre-Dog V"