Go thru Guided Setup again, and tell the TiVo that one tuner has basic analog cable, and the other (the one that'd normally get a cable box if you had one) is hooked into a satellite box.
Identify your service, etc, and finish guided setup.
You'll be able to record analog cable on one tuner, and satellite on the other. (Possibly analog cable as well.)
No sidewalks with beef, please.