The connector Lucky_Dave mentioned is a joiner a yellow/green wire (looks like it comes from the back of the car) comes out of the wiring loom at one point goes to the "joiner" and another yellow/green wire goes back into the same loom (to the front of the car). I think I have a circuit for a divider circuit somewhere and this will be the next step. The pulses are definitely speed related, but only problem is that they are of too high a frequency for the 202. Wired up the Terratrip 202 and drove around the block. I put a CRO (oscilloscope) onto the wire and drove slowly up an down the driveway bingo, a nice square wave (about 12V in amplitude). I've located the wire that Lucky_Dave mentioned (very accurate description.thanks).
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