Engine RPM 2 Vacuum help

[My92cashtrap]

I purchased a RPM2 intake, and am in the process of running my vacuum lines. In order to do so I'll need to remove some of the plugs and screw in ports/T's to the upper manifold.

Simple question: Best product to use on the threads to make it airtight? Plumbers tape? Plumbers liquid seal? Other?

TIA

 

[7991LXnSHO]

If no electric conductivity is needed (like on sender threads), I am a advocate of PTFE tape, especially when using different metals (electrolysis) and if you ever want it to come apart again.