Call, Roe Racing, West Coast Viper,or the speed light company that supplied the shifting lights for the GTS. I can't thik of there name, but all three of these people would know this, as they are into the PCM. Do a search on shifting light under the GTS section. I to would like to have a better light setup, multiple lights, amber, going to red, adjustable rpm span on the lights, great setup.
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