I bought an old kinze double frame 6/13. they put two extra units on the outside of the front rail. planter has a dicky john system on it now. i want to replace with something that will show me population. only use it for planting beans so population is really all i need. will use for corn if i get in a bind and need it for a day. the corn planter is set up with a 20/20 monitor from procision. im guessing my best bet is to set it up that way so i can use the same monitor and not buy a second one. not covering any large number of acres. any suggestions?