Wideband O2 Gauges

AEM 30-4110 
For non-CANBUS vehicles (2006 and older typically)

AEM 30-0334 
For CANBUS vehicles (2007 and newer typically). Direct plug and play with MPVI2.

Wiring HPT Prolink to AEM 4110 instructions - Black wires from both AEM and Prolink go together to chassis ground.  Prolink red wire and AEM white wire go together. ALL OTHER WIRES ARE NOT USED.