03-12-2015, 04:09 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 21,897
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Not Ranked
You should be able to reach up under the dash, and with a little square spacer that fits in to the gauge, "spin it" between your thumb and forefinger and see that the speedometer works. On my thread from this past summer I have shots of the 19 tooth gear that fits in my Tremec TKO and I have a 3.54 rear with 295/15 tires. I have a couple of those gears and they're not all the same color. It's a Smiths gauge but it's within 3 MPH of being correct (and it doesn't bounce).
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