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post #6 of Old 09-16-2019, 04:33 PM
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Re: 4TNV98 RPM meter take off

Seems to have an ECM that fiddles with the injectors, etc. Bet there's an output from that which is used to operate a tach.
Page 9, number 3, the 'speed sensor', optional...

Or the 'service manual' from here:

An electronic display would need to be wired, by individual wire conductors, to the engine to have information to display. Follow the wires back to the engine. Think on where the wires are attached, such as sitting by the crankshaft(crank position sensor), perhaps used to count revs?, or the cam position sensor, ditto. Other methods would be 'derived' numbers, such as counting injector pulses.(same as cam Hz., 1/2 crank)

simplificate & add lightness

It's not how hard you work, it's how much you get done.
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