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Zeke3 · 03-03-2026, 10:46 AM

Why don’t you just calculate the difference? All you need is the tire diameter or revs/mile, the overdrive ratio and the rear axle ratio, which you already told us. Let us know if you need help with the calculation.

03-03-2026, 10:46 AM	#2
Zeke3 Senior Member Join Date: Dec 2014 Location: Columbus, IN Posts: 1,647	Re: Tachometer for 59AB engine Why don’t you just calculate the difference? All you need is the tire diameter or revs/mile, the overdrive ratio and the rear axle ratio, which you already told us. Let us know if you need help with the calculation.