You can always use a $25 Shure gauge like I do. You need to fine tune your tracking force and VTA by ear, anyway. If you're not constantly changing cartridges or arm wands, just use the Shure to make sure you're not accidentally way over the manufacturer's maximum tracking force, and follow Lloyd Walker's advice for fine tuning your turntable setup.
And, yes you do need a tracking force gauge of some description.
And, yes you do need a tracking force gauge of some description.