Welcome to the forums..LED Visualizer is included in most recent
NVIDIA Driver packages up to about 373.06 and in
GeForce Experience..The NvLedVisualizer.exe is tucked away in (for example) the C:\NVIDIA\DisplayDriver\373.06\Win10_64\International\LEDVisualizer folder..You can try it from there and see if/how it works for you..If it works it works, if it don't it don't.
You can snag the LED Visualizer from an older driver package since it's not included in new driver packages.
If your card supports any LED Visualizer functions, even with limited functionality, you should be good to go for what it offers..If not, it don't.
You can check in your current driver package (typically saved in C:\NVIDIA) unless it's been deleted somehow and see if it's there and if not or try the stand-alone one linked to above by Sajin or snag it out of another driver package and then you can delete the driver package if you want to..After you extract a driver package you can copy the LEDVisualizer folder from the driver package to wherever you want and make an NvLedVisualizer.exe shortcut to wherever want and see how all that works out..Precision XOC is still a work in progress, it seems..Just sayin'.