I just bought a Kioti ck35hst. I want to engage the rear pto for a 4ft bushog, I'm about to exchange for a 5ft bushog. The rear pto lever has 540 an 1000 speeds. Which one do I use? The tachometer says to operate the pto 540 at 2600 rpm. Do I engage at 2600 rpm or at a lower rpm. Which...