Didn't need to replace the sensor, only the strap. HRM with Garmin 910XT works great now!
This replacement strap works perfectly with my Garmin 910XT.  I starting getting very erratic data errors with my old strap, and thought I would have to replace both the strap and sensor, but before doing so, I thought I would try just replacing the strap only.  This replacement strap worked great, and cost only $12.50 to fix the problem.
Rating: 5 stars