Originally posted this in V8 section, but moved here...


Planning to install L cluster with boost cauge - just wondering where to connect vacuum tube (I'm planning to use regular nylon tubing).

Old thread from V6 section (https://www.f150online.com/forums/v6...uum-gauge.html) suggested using a capped T-connector behind battery.

I would assume it's this connector in my truck - correct?

 

With the engine idling, pull the cap off the T. If the idle rises & you feel strong vacuum there, temporarily connect the gauge. It should show 18-22" of vacuum.