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markdtn · 08-04-2025, 10:24 AM

I have the instructions. It's a 3331106. It shows up on page 71 of this catalog. So it's older but was brand new in a sealed box.

https://www.vdomarinegauges.com/wp-c...-Catalog_1.pdf

If you hold a button down while turning the ignition on it toggles between programming modes. You can set it to 4 stroke and 8 cylinder in 1 menu and then set the pulses in a second menu (both of these were set correctly for me out of the box).

I'm just perplexed at why 3 different tachs all act the same and will not show over 1000 rpm? I'm going to dig out the Sears dwellmeter and make sure it still reads reasonable numbers for RPM. Just wondered if anybody else had seen this issue and what fixed it.

Thanks!

08-04-2025, 10:24 AM	#3
markdtn Senior Member Join Date: Jun 2016 Location: Chattanooga, TN Posts: 164	Re: Modern Tach won't work with points? I have the instructions. It's a 3331106. It shows up on page 71 of this catalog. So it's older but was brand new in a sealed box. https://www.vdomarinegauges.com/wp-c...-Catalog_1.pdf If you hold a button down while turning the ignition on it toggles between programming modes. You can set it to 4 stroke and 8 cylinder in 1 menu and then set the pulses in a second menu (both of these were set correctly for me out of the box). I'm just perplexed at why 3 different tachs all act the same and will not show over 1000 rpm? I'm going to dig out the Sears dwellmeter and make sure it still reads reasonable numbers for RPM. Just wondered if anybody else had seen this issue and what fixed it. Thanks!