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I've used a slightly newer version of the 303Plus quite a few times and it's a pretty decent odo. The easiest probe to use is a speedometer probe if you have a mechanical/cable speedo in the car. Any Terratrip speedo probe should work. You just splice it in by screwing the speedo cable into the probe and then use another section of cable to go from the probe to the gearbox.
If no mechanical speedo, you can use a wheel probe. You'll have to fabricate a bracket to hold the probe near the wheel. The problem we had with wheel probes is they tend to get knocked around and clogged with mud. And if it's on a driven wheel, wheelspin gives you an inaccurate reading so you're constantly adjusting/recalibrating on the fly.
The 303Plus manual should have most of the info u need to operate the 303. Nice find!
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