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Installing the Boost Tube:
There are two methods for attaching the boost tube:
- Tapping the intake elbow (recommended)
- Tapping the MAP line
Although both methods work, tapping the intake elbow provides smooth readings throughout the boost range. Tapping into the MAP line can cause "boost gauge flutter" at higher PSI's.
Project "JAKD" was already equipped with Accufab Racing's Power Air Inlet which came pre-drilled and tapped to accept a 1/8" NPT fitting. For stock intake elbow removal prior to drilling/tapping see the Accufab Racing Tech Article. Installation of the boost tube fitting on the stock elbow will be the same as the Power Air Inlet after it is drilled and tapped.
 
In order to keep things neat under the hood we chose a stainless steel 1/8" NPT elbow fitting from www.swagelok.com. Part #: SS-200-2-2, SS Swagelok Tube Fitting, Male Elbow, 1/8 in. Tube OD x 1/8 in. Male NPT
It became evident that a straight fitting would cause the boost tube to interfere with the oil or fuel filter caps when performing scheduled maintenance. Installing an elbow fitting and turning it towards the passenger side of the truck would route the boost tube away from the caps and keep things tidy under the hood.
Use teflon tape on the male portion of the NPT fitting. It is not necessary or recommended to use teflon tape around the ferrule. The ferrule will compress and create an air tight seal around the boost tube. Using teflon tape at this location can prevent the ferrule from doing its job.
It is a good idea to leave some slack in the boost tube behind the firewall. If the boost gauge ever needs to be taken out, the slack can be fed up through the POD allowing the gauge to be removed. Once the desired length is determined it is safe to cut the boost tube to length.
Attaching the boost tube to the 1/8" NPT fitting:
- Insert the compression sealing nut (cap) over the boost tube
- Insert the boost tube through the ferrule
- Insert the boost tube into the male fitting and tighten the compression sealing nut (cap) by hand followed by 1.5 turns using a wrench
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