08-01-2002, 09:17 PM
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CC Member
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Join Date: Feb 2001
Location: Jacksonville, Florida, USA,
Posts: 175
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Not Ranked
I'll take a gander at this one.
I'm pretty sure the tach signal is straight foward 8 pluses per revolution (for an 8 cyl engine) with time being the constant. Voltage between 12 and 24 Volts. A VDO programmable tach shows a calibration range of .5 to 200 pulses/revolution. I suspect this is when the signal is pulled from an Electronic Ignition Control Box.
As far as the speedo, I know my VDO which uses a hall effect sensor at the tranny, indicates a calibration range of 500 to 3999,999 pulses per mile. I think the default is 16,000 pulses per mile.
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