No, this adapter is not required for installation however, it will make the install easier so you do not have to drill and tap into the intake manifold. GlowShift’s 7.3L Power Stroke Air Intake Heater Boost Plug is designed specifically for the 1999.5 – 2002 Ford Super Duty and will allow you to easily read your truck’s boost levels without having to make any permanent modifications to your truck. This intake air heater boost plug replaces the air intake heater and eliminates the need to drill and tap your manifold. The female 1/8-27 NPT thread allows you to easily install your electronic boost pressure sensor or fittings directly to the boost plug for extremely accurate readings directly from the source. The size of this thread adapter is Female 1/8-27 NPT to Male m22 x 1.5.