I have a Ultrex T Motor with no graph hooked to it. If I purchase a compatible graph and hook it up to the Ethernet connection “ I think that’s how it hooks up” wouldn’t that prohibit me from hooking up a mega live to the same graph? If so is there a solution?

Ultrex has three different built-in sonar transducers (US2, MDI, MSI) and two different iPilot versions (iPilot and iPilot LINK)

The Ultrex would have to be the iPilot LINK model to connect to a Humminbird. LINK comes with a 30' Ethernet Extension cable.
To connect an Ethernet cable to a Helix requires the AS EC QDE Ethernet Adapter.

MEGA LIVE will be an Ethernet connection and it comes with a 20' Ethernet cord.

Yes, you would need the AS ETH 5PXP Ethernet Switch to have more than two Ethernet connections.
The display, LINK, and LIVE would connect directly to the Switch.