If you're rooted I don't see why not ... first uninstall the current Gmail (I use root explorer to delete system apps) and reboot. Then drop this apk on you sd card and install it with astro (or a similar file manager app)
Being that Gmail is available on the market, I would assume it will work for for all devices ...
Sent from my Incinerated DROID
Delete the Market version, drop this into system/app with root explorer, then set the permissions on it to rw-r--r--. After this, reboot.
Awesome, and no, the permissions were changed to the same as every other system app, and also the same as any apps in the data/app folder. When GMail updates, it will install the updates (that are uninstallable from the Market or Settings). Something to do though, go into your My Apps list in the Market and turn auto-update off for GMail. You'll get the notification, but won't update on its own.
It may show up back in there again, some of the themed apps i have in my system folder do. It may be a ways down your list... nonetheless, if it updates automatically, you can go into the market and uninstall the updates.
Dumb question: I download this to a PC and then unzip to locate the Gmail.apk which is what I will replace the existing (assuming there is one) Gmail.apk then boot into recovery & install the zip? That all sound about right or do I leave the Gmail.apk file if there is already one in there? Just want to make sure I fully understand the process on this one before I attempt.