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I think it worked really well. I painted over the numbers with flat black, and then went to a hobby store to get white rub on numbers. I relabled it for 4k. After that I reassembled the glass and bezel. Just a note about calibration. I never did get an optical tach, but the method I used...

I figured it out. :jumpin:I asked a friend of mine about a divide by 10 circuit, and he suggested that a gas tach already has the circuitry, all I need to do is either adjust it or modify it for my needs. So I opened up the tach and sure enough there are three pots (aka potentiometers...

Well I hooked up my 8k tach, and it pegged out at 8k imediately with the engine idling. so I switched it to 6 cyl, that brought it down to 7500, and then to 8 cyl which brought it down to 4500. Which seemed promising. so then I reved the engine. I'm guessing I was reving between idle 600 ish to...

Ok I think I found the solution, or at least an easier solution. I have been modifying my extra alternator to use as a welder since the PO converted my M1009 to 12, so I've been reading alot about the delco alternators. It turns out some of them have an extra pin that is used for a...

Ok I hooked up an oscilloscope, see picture, to pin D, I also tried F and it looked essentially the same. The picture was taken at, my guess, 1500 rpms. It is putting out a very dirty and spikey sawtooth wave. the period was approx 300 microseconds which works out to 3.33 khz frequency, It...

Has anyone ever figured this out? The diagram for this circuit refers to the california ESS signal for the sawtooth waveform. Does the J code 6.2 have a similar device? Has any one ever looked at pin E (the tach pin) on the ste/ice diag plug to see what is actually there? I would really like...