You can gut the factory prop valve with the Motorsport "plug" for like $9.
See my M2300K
INSTRUCTIONS page.
The adjustable prop valve is like $50 and sits right next to the passenger side hood hinge. Piece of cake to install like in
THIS photo.
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Darius Rudis
Roadracer: Home built t-arm/panhard suspension powered by an S-trimmed motor :-)
My Mustang Page