71 mustang firewall speedometer opening ?

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Hoagie Ranch

Active member
Joined
Jan 3, 2022
Messages
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My Car
1971 MUSTANG MACH 1 429 SCJ
Does anyone know what opening in my firewall the speedometer cable goes through. Can't seem to find a 71-73 Mustang firewall diagram on line. I have attached photos of my firewall . I have it narrowed it down to 2 holes , maybe the one close to the power booster or the hole farther left of power booster seems to be better location . The cable fits through both holes. I have seen other nice firewall diagrams on the vintage mustang forum but only for the older stangs.
 

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Doug's 73 Mach1

Well-known member
Joined
Apr 25, 2020
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146
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58
Location
NJ
My Car
73 Mach 1, Q code, 4 speed, fully optioned
Mine too comes through the hole behind and above the brake booster, pretty much a straight shot from the back of the speedo.
 
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