Is your Mychron still for sale? Just to be clear, it is a Mychron 4 2T, correct? If so, are the Leopard sensor leads different than standard H2O/EGT temp leads?
The Mychron 4 2T will monitor and display two temps (usually EGT and H2O) at the same time via two separate sensor leads. The standard Mychron 4 just monitors one temp and only has one sensor lead.
It should say Mychron 4 2T right on the main unit. (see below)