The rear plug of a Holley Hi-Ram is often an issue if you are not using a factory LS3 style MAP sensor. It is difficult to plug and then limits your Vacuum reference ports as well. WE have created this plug/adaptor which comes with a 1/8" NPT port for screwing in 3 Bar map sensors, push to connect fittings or plugs.
These ports have a 1/8" NPT female ports for hooking up push to connect, AN to NPT ports, and more! You can also screw an NPT style MAP sensor directly into.
