Yes, it can be removed on the same way as the speedo/tacho, by uncrimping the fold at the back with a small screwdriver.
You have to undo the oil pressure pipe from the back but because of the temp. gage capillary tube, it cannot be completely removed. With the steering wheel removed, you can create enough room to work on it in situ.
Yreat this exercise as a project and change all the bulbs while you're in there.
Note: The rheostat knob comes off with the glass!!
naj