Quote:
Originally Posted by johnbullas
In the case of the tachometer (rpm) a 0/12v pulse exists for the Mega to monitor
In the case of the vacuum gauge a custom pressure/vacuum measurement device is required
In the case of speed the rotation of the speedometer cable needs to be monitored (and a turns per mile value used to convert to speed) else a hall effect transducer will need to be used !
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The VSS senders I linked will provide this at a much higher resolution than 1pulse per tire revolutio. I used this one
SPEED SENSOR, MECH TO ELEC, GM & CHRYSLER, 7/8"-18 THREAD, HALL EFFECT, 16 PULSE
On my 79 K-20(3/4ton 4X4 Chevy). When I custom built the dash all electronic. Something like 32000 pulses per mi on 33"s and 4.10's. Its been 9 years and no longer have the truck. As a bonus your stock mechanical speedo can be retained this just plugs inbetween your cable and Trans.
Gumby stay flexible