The actuators are found on the internet - there are a variety of companies. I used Firgelli. The microswitch activates a couple of LED on the dash to indicate UP position. I had bought potentiometer actuators, intending to install an indicator in the cockpit. But I changed my mind when I realized if the linkage breaks it would still show up or down position on the indicator. I now use the main shaft to activate the microswitches independent from the actuator to give me an accurate wheel up position reading.
Ron