Sending Unit Help 1974 C10

[waters5]

I Have a single tank on passenger side of a 1974 Chevy C10 Cheyenne Fleetside i recently updated my guages to Digital Dakota VHX. I am having issues getting my Gas gauge to work not sure if i am connected to wrong wire behind Dash or have bad sending unit. So i am at the point i am going to Run a new wire from gauges to the Sending unit while i drop the Tank i am going to Install new Sending unit as well.
The Problem I am having is trying to Pick the correct Sending unit. I see three available options to hook up lines. One Outlet, Two Outlet, Three Outlet style Sending units Unsure what one i Need for my 1974 Trying to Avoid Dropping tank just to Order sending unit if i can Avoid it.