Contacted seller. This is his response.
Basically to get them to work we have to either tap power from the DTRLs into the turn signal, or another power source (i.e. battery if you want the switchbacks on all the time...)
Write-up on how to get the switchbacks to work (courtesy of tacoma world):
http://www.tacomaworld.com/forum/1s...gnals-running-lights-switchback-leds-how.html
Write-up on how to wire in a resistor to prevent the LEDs from hyper flashing (courtesy of clubxb):
http://www.clubxb.com/forums/showthread.php?t=32974
I have not attempted the switchbacks yet... thinking about purchasing the VLED ones but shopping around for other options. I'm going to wire in a resistor later today and throw in amber LED turnsignals.
Marus also stated that he used switchbacks before in the FX. Will try PMing him also...