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Heres what I did on my 2000 Expedition....I took off the factory oil pressure switch, used a hose barb in that location from there I installed a high pressure high temp hose to a T-fitting so than I can install the factory oil pressure switch and my Auto Meter sending unit...it works great....I also used a bracket to mount the T-fitting to the frame and out of the way of any movement of the steering or suspension.....I should of taken pictures of the install I did. Hope this helps...
....Gage