I googled and read some reviews of the TireGuard TPMS system like you have JoeVibe. Overall it looks good but several articles referenced reports (none documented) of failures, some multiple. Could not find any write up by someone who had experienced a failure so may be exaggerated - can't trust anything you read on the internet - well, that's what dealers say, lol!
I may give it a try as it is inexpensive enough and easy enough to install. Couple points noted: the display is not waterproof and hard to see if one should decide to mount it with velcro, etc. Display uses AAA battery with life of about six months. Sensors use 3v watch type battery with claimed life of one to two years.
Sensors weigh 45 gms and while no wheel balance problems reported it was noted that the weight may be too much for some valve stems (rubber), causing sudden failure, and they suggest that the product should be used with metal valve stems only. No problem since I think all CVOs have metal valve stems but non-CVOs may not.