The York came with the flat sight glass that is almost useless because of its low, rear-facing position. I had to buy the domed sight glass and adapter separately. Here are the links for future readers.
Oil Sight Glass, 1/2 NPT Hex Head Domed https://www.amazon.com/dp/B09DPPJGCJ/?tag=wranglerorg-20
3/8-Inch Male Pipe x 1/2-Inch Female Pipe https://www.amazon.com/dp/B08N657TR3/?tag=wranglerorg-20
Installed! Is this enough oil?