IH tachometer April 11, 2019 01:46PM
Does anyone know what the tachometer drive ratio is on a IH 400 series engine. I have a factory drive on my 1066 and want to add a electric tachometer that uses a pickup sensor mounted on the tach drive to operate the gauge. But in order to calibrate it I need to know the drive ratio. Any help would be greatly appreciated. Thanks.
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Re: IH tachometer April 12, 2019 06:50AM
Simple, Put a mark on the tach drive and turn the crankshaft and count the revolutions till the tach drive completes one revolution. That will give you the ratio.
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Re: IH tachometer April 13, 2019 02:12AM
I knew that would work but on a fully assembled engine that’s easier said than done by myself lol.
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Re: IH tachometer April 12, 2019 02:57PM
3 to 1
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Re: IH tachometer April 13, 2019 02:14AM
Thank you very much. I was certain someone would have wondered the same thing and found out. You guys are awsome
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