Looking at a early hagie sts12 sprayer ( I believe it was serial 20 or close to it ), seems to be in good shape at dealer . It has john deere 1800 display and atu for steering. What would I need or what would be my best way to get auto swath , and at what cost ? Trying to weigh my odds to see if I should pass on the machine or buy it if we can set it up for a decent cost. Thanks in advance