speedometer gear

[Fox Body]

Okay. Since we're on this topic....
The Mustang I'm driving has been converted from V6 to V8 (351W, yeah baby!!). Got 3.55s in an 8.8" and C4. Any body know what speedo gear I'll need. Thank you thank you.

P.S. I didn't know you need one for both tranny and speedo.(?) Will I need one for both?

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'79 Mustang Coup
4" Cowl
Weld wheels (15x6;15x8)
Stock 5.8L
C4 w/ shift kit
1.5" MAC full length headers
Holley 750 CFM
Edelbrock intake
2.5" Off road H-pipe, 2-chamber Flowmasters
8.8" Rear end w/ 3.55 gears (Now that's more like it!!)
Front: 225/60/15 Rear: 255/60/15 Eagle GT II
14 x 4” K&N air filter (getting the Xtreme setup soon)

"Red, thou art my companion. Hasten now your quickened metamorphosis to Green that I may conquer all who dare abide there beside me. May they be left thither behind burnt black." ---Fox Body