I have an answer for Caigauge about speedo inputs which may prove handy.
Does your sensor have 2 or 3 wires?
If 2, the sensor generates a sine wave shaped signal that can be measured
with a voltmeter on ac setting. The signal needs to be greater than 1 volt
ac to trigger the speedo.
3 wire senders generate a square wave signal, measuring this signal with a
meter is more error prone.
If you have an oscilloscope, look at the signal with the speedo connected to
confirm that the signal amplitude is greater than approx 1 volt above
ground.
When I connected the sensor up to oscilloscope I only got a ragged signal of 0.5vac.
Off to the local scrap yard methinks.
|