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tubman · 07-26-2015, 08:02 PM

If anyone is interested, I am having a friend who is an electronics expert working on converting a 3 1/2" Sun-Pro tach to work on 6 Volts Positive ground. At the present time, we have it running and are now at the point of getting it properly calibrated. He tells me that the problem is that the signal from the distributor is -6 volts and the problem will be easy to overcome. When done, I will run the prototype on my '51 to check accuracy and durability. The Sun-Pro tachs come with black or white faces, and are not that bad looking. We expect to be able to make these in the $50 to $75 price range.

Stay tuned.

07-26-2015, 08:02 PM	#12
tubman Senior Member Join Date: Dec 2013 Location: Minnesota, Florida Keys Posts: 10,319	Re: 6 volt positive ground tachometer If anyone is interested, I am having a friend who is an electronics expert working on converting a 3 1/2" Sun-Pro tach to work on 6 Volts Positive ground. At the present time, we have it running and are now at the point of getting it properly calibrated. He tells me that the problem is that the signal from the distributor is -6 volts and the problem will be easy to overcome. When done, I will run the prototype on my '51 to check accuracy and durability. The Sun-Pro tachs come with black or white faces, and are not that bad looking. We expect to be able to make these in the $50 to $75 price range. Stay tuned.