I have a 1970 Camaro and and upgrading my tail lights to LED. I purchased a set of United Pacific Industries (UPI) tail lights (for the brake/signal lights only). I recently watch a UPI video on facebook ( https://www.facebook.com/upcarparts/?rc=p ) where they installed two of their LED lights on each side (dual tail lights) and they operate sequentially with "an optional module". I asked them what optional module they sell to make it work and they said the module at this link ( http://www.uapac.com/antique/12v-electrical-flasher.html#q=LED+Flasher+2+Terminal+12V+(90652)). This looks to me like the typical LED replacement flasher you need to upgrade to LED and NOT the "optional module" needed to deliver the sequential performance. The single UPI LED just simply plugs into the OE brake light bulb sockets which is super easy. I am wondering if installing a standard UPI tail tail in place of the back-up light together with this single LED flasher...will that give me the sequential function? Or do I need to install and additional LED flasher (i.e. two of them)? Has anyone tried this before?