Note to self...
The Harley Oil Temp Gauge (75320-05A) faceplate is prone to popping off. Take care while installing the gauge so when the glass plate comes off you don't drop it causing it to shatter.

too late.

Note the air temp gauge is constructed better then oil temp gauge. Glass can be removed from air temp gauge but takes time due to better construction. Glass face plate in air temp gauge is about 1/16 of an inch smaller then oil temp gauge. The glass can be forced to fit the oil temp gauge but may leak during wet periods.
Broken parts cost: $0.99
Total cost to note installation cautions:
Oil Temp Gauge (75320-05A) $139.99
Air Temp Gauge (74715-09) $49.95
Value of lesson learned, priceless.
See HarleyCharlie1992's note about using the air temp gauge bracket instead of the one included in the kit to prevent this from happening again:
CVO Dash Oil Temperature Gage question