The AEM failsafe uses a lowside ground to enable the failsafe measure. It can be wired to a number of things. Many select to use it on the EBCS to cut boost in a lean event. It CAN be sent to the ECU as a means to pull timing out or cut fuel but a good tune is already going to have those counter measures.
Heres a shot of my wiring harness from Jacob at TuckTech. Its just a relay in line with the EBCS/EVAP harness. As soon as the gauge alarms, it kills power to the EBCS and drops you to wastegate pressure. TuckTech even offers the AEM Failsafe with this harness as a plug and play. No splicing required. Shoot him an email if you are so inclined. He will just need to know what kind of EBCS you are running for the connector type.
tucktechjacob@gmail.com
