I have to go even further.
1. If its already checked, uncheck it.
2. Select the COM port and hit OK
3. Check it.
It's a pain because i save the LC-1 on my profile, and then when i turn on the ignition it detects the current value of like 20.53 or something, and puts that on the data screen, but then never updates after that. I have to follow the steps above, then it usually works. Sometimes i get 0 after it though, and have to repeat a few times.

Would be great to see this fixed in the next RomRaider version.