ArduRover

I have APM 2.6 and does anyone knows how  to connect ultrasonic sensors and how many can we connect and if we connect more should we have to program it

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ardu rover

I am trying to connect my apm  to sabertooth 2X25 but when i connect it it is not working

1) I installed the ardurover firmware

2)I have connected apm pin 1 to sabertooth pin s2 then pin 3 to sabertooth pin s1 

3)Receiver 1 to 1 , 2 to  3, 5 to 8 and 6

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