Sure. First, the mounting was done by using one of these f150 vent pods from Roush. The f150 and expys vents look pretty similar, right!? They arent...
so essentially, I removed the outer ring on that f150 vent gauge pod and then slowly filed the edges of the 6 points (once you cut the outer ring off. That is almost the exact dimension of the inner circle of the expy vent setup.
On the expy vent, first remove it from the vehicle. There are 3 tabs on the outside of it, the one picture here shows the side to see those tabs, they are a bear, but they do come out! Then remove the chrome trim piece. Save the chrome piece, but you will be cutting away the cross pieces of plastic inside the vent to allow for the gauge to sit far enough back.
Your left with the outer ring of the expy vent, the inner ring of the expy vent with the fins removed and the cross piece that holds the fins in place removed, and the 6 pointed gauge pod.
I fit the gauge pod into their pretty exactly and then drilled very small holes and secured each of the 6 points with small panhead screws.
It is absolutely secure. No movement at all. Before placing it all back into the dash, you have to drill a small hole for the air line and power wires in the side of the air vent ducting. I took the wiring over to the passenger side glove box area and found an ignition switched wire and tapped into it.
The air line I ran through the firewall grommet around the main wiring harness.
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