GFX 750 external mapping switch and GPS speed to a krm sower

[Massey 6470]

Have the expansion port multi cable plugged into the back of the 750 but can’t get a GPS speed to the krm sower- I’ve a 7 pin din socket plugged into the P4 radar / dig on the loom but nothing also my external switch connected through a relay the same way my cfx 750 was ,no joy either and I’ve switched it on in the menu

 

[Robt]

Are you trying to do GPS speed or simulated radar pulse ?

 

[Massey 6470]

Dunno what ever works; I’ve the krm showing speed now but the Trimble needs set between 17-60 hz/kph and the krm 1-999 something