I don't know about the compatibility with Tone's Flasher Unit. However, the kit in your website link would only be worthwhile if the VX's 3rd brake light LED's could be "divided in half" (left-half LED's for left blinker ~ right-half LED's for right blinker). Just having the VX 3rd brake light blink fully across the entire rear spoiler when the turn signal is activated without indicating a specific direction (left or right) would be an absolute worthless modification.