An air seeder includes a combination tank propulsion vehicle with mounted product tanks, and metering devices dispensing product from each product tank. A furrow opener implement is towed by the vehicle and an engine rotates the vehicle wheels and two or more implement wheels. A pneumatic distribution system conveys dispensed products to the furrow openers. The external guidance system sends location signals indicating a location of the implement frame to the operator. Steering, metering, and distribution signals are sent by both the external guidance system and an operator with a remote operator control, and operator signals override signals from the external guidance system.