We have an older Terratrip 1 in our rally car and can confirm the newer probes work just fine. As CurtEgerer said, the probe which fits in the speedometer cable works great if you have a speedo cable. There's a very detailed write-up here;
https://stevemckelvie.wordpress.com/2015/11/02/installing-a-terratrip-speedometer-cable-pulse-generator-sensor/
If you don't have a speedometer cable there are plenty of purpose made probes available, as mentioned. If the wheel speed or driveshaft speed isn't attractive, there are options which tap in to the ECU's speedometer signal.
Nice find!