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I installed mine dry, then ended up with a slow leak so I pulled it back out and taped it. It depends though- is your sender a single wire that grounds through the sensor, or a two wire sender? If its two wire- tape it up. If it's a single wire sender, taping it might not let it ground properly.
One wrap of teflon and it seems to be working fine. It was hard to get it up to temp today when it was only 60 or so out and my gauge doesnt start til 100!
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.