A GFX750 can seed monitor with the addition of FieldIQ module and harnessing. If that’s all of the Field IQ you will be doing with the GFX, then try to find a 76774-05 module with a 87843 harness. So long as your planter has high rate DJ style sensors and a PM (DJ) or CT (JD) 37 pin plug this harness will mount in the cab and extend to the hitch connector. The 87843’s CAN will plug into the 111083 (or to a maser switch off the 11083 and it’s comes from power the display power bus 67259. As described in the AgTalk link it works with either of the 37 pin plug pin outs of up to 24 rows.