Ahoy tdalke - I have a similar setup on Liberty and have helped others set theirs up. It works fine. Like previous posters said, you just transmit into the SGC 230 and it tunes.
I wanted to add that you might want to go into the M710’s “Set Mode” and change the “Automatic Tuning Condition” to OFF. That’s documented in the M710 manual. In that mode the M710 doesn’t try to communicate with the tuner, it just transmits, which is what you want. “OFF” is the default setting, but perhaps yours got set differently somewhere along the way.
You also dont need to worry about the “Non-Icom tuner” section in the M710 manual. Those switch settings are for communications
between the radio and tuner and don’t apply to the SGC 230.
Finally note that as long as the SGC 230 is powered ON and it is tuned to a particular frequency (i.e. you have transmitted through it) it retains that setting until you transmit again on a different frequency. So if you change channels on the M710 and just want to listen, not transmit, then the tuner will remain tuned for the previous frequency, which can attenuate the signals you want to receive on the new frequency. In other words, the tuner doesn’t “know” you’re on a new frequency until you transmit. This can be a problem if, for example, you transmit on your favorite net, then switch to receive weatherfax or a time tick. In that case, for maximum receive sensitivity, you want the tuner to switch to “straight-through” mode without tuning for transmit. On the SGC 230 one way is just to power-cycle the tuner. This works because the tuner comes up in “straight-through” mode when it powers on. Another way is with a little circuit SGC calls “SmartLock” which can reset the tuner to “straight-through” without power-cycling it. They provide a simple schematic in the manual. For the reset function all it does is momentarily ground the White/Red wire from the tuner. It also uses the White/Black wire to indicate when the tuner has found a tuned setting, which is good to know sometimes. Not crucial.
Enjoy your rig. Not only can the SGC 230/Icom M710 combo work, together they make a pretty bomb-proof HF installation