So the 3157– you ordered the Amber or White one? I clicked on your link and it made me choose which color to order— I assumed “Cool white”?I changed all of my exterior bulbs to LED and wanted to use the switchback bulbs up front because of their dual funtionality. The 3157 (I got mine from lighting next) was simple, just plug and play. The 194 was not so simple because the polarity of the input signals have to be reversed in order to get the bulb to flash amber with the turn signals, but, with a lot of research, I was able to figure it out. I think it turned out pretty cool. I haven't seen anyone else around here with this setup yet.