Change lookup field on custom module

I did this a while back, but had server issues and lost the code and for the life of me cannot find an article on it.

Needing to know how to change field on related link to get away from the Name or Full_Name.

I created a Household Module in which 1 Household has many contacts.
Using DTG SugarCRM Autoincrement Field I created a HH_ID that I would like to use in lookups for Household

ie…From a Contact view… I would see related field as HH_ID vs the Name on Household module

Any help is appreciated.