Call me lakatan, 80 Years young, retired military, Vietnam vet with disabilities. I have been riding bike for many years. about 3 years ago I bought a rear wheel ebike kit and a KMart mountain bike special. The hub is rated at 800W but most likely higher. And a 48V lithium. I can run between 28 to 32 MPH on level surface. Love it and still have it. A month ago I saw some 20" fat tires running on beach sands in California. Well my MTB's tires are thinner and gets buried. So I bought an Ecotric 20" fat tire. Love it too. But it can only go 22MPH on level road. I want it to go faster so I bought a S866 display cause I read it can be programmed to go faster. The S866 has 5 pins but the 36V controller only has 4. So I match the colors but I have a yellow wire form the S866 that I do not know where to connect it to the ecotric controller. Does anyone have any suggestions so I don't burn up the controller. Thanks a million guys.