Don't know what fitting to use. But if you're mounting a mechanical FP gauge inside the car, that is a real bad idea. You should ALWAYS mount mechanical gauges outside of the drivers compartment, just incase of a failure you don't get oil, coolant or fuel all inside the car with you.
If you want the gauge inside the car, get an electrical FP gauge.
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1989 Mustang LX Notch
5.0L, T-5, 1969 351W heads, cut & welded stock plenum, F-303 cam, Mac 1 5/8 full length headers, Cat'd H-pipe, 3.73 gears, Underdrives, SSM lift bars, E-Fan, 3G Alt, Custom Chip, Autometer gauges, Weld Draglite wheels , M/T ET Street Radials
Best 1/4: 13.33@101.53MPH
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