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Anyone know what this thing is?

Stock o2s and plugs. Passenger side plugs seemed to have a little oil on the threads. Anybody else experience this? Btw the f150 o2s don't reach with the long tube headers I have on the driver side. Unless you're comfortable with the wire being a few inches away from the header.

Like the title says, has anybody replaced their vacuum gauge with a boost gauge? How do you get this little sucker out. Also is it electrical or is there actually a vacuum line behind the gauge? I would like to directly replace it with a gauge that reads boost.

Yesterday I took the car to the dyno to see what it would make on my tune vie been working on for a little while. Made a couple timing changes while I was there trying to squeeze every hp I could out of her but wasn't very effective. Ended up making peak 645/518. Mods are LTH, Borla cat back...