This 1268 controller with adaptor harness is designed to be used with Nivel motor # 3267, 7146 & the stock motor only. The combination will provide extra torque with speeds up to 23 mph on stock tires. A great package for MEDIUM DUTY lifted cars. For maximum performance, safety and duability, 4 ga cables (1258) and heavy duty solenoid (30911 or 30912) are recommended. This controller is programmable with the Curtis hand held programmer (Nivel # 1311-3301). 9” x 7” x 3”