Recently acquired a 2008 Vespa S150. With the help of this great forum I was able to gather info on how to proceed with the LED conversion. Here are the end results.
Simple to do really.
Purchase 1157 3-wire bulb sockets for the front. Along with 1157 switchback style LED bulbs. Eliminate stock pod indicators. Cut off existing bulb sockets on white running lights. Wire in the new 3 wire ones. (If you need details on how to just ask!) I used the Signal Dynamics Dual load equalizer. It is super simple to wire in and tucks in perfectly. Rear bulbs were PY21W amber replacement LEDs. I though I would need another load equalizer for the rear but I guess the PY21Ws draw enough current and the blinking is fine. I am attaching some photos and videos.