I have never had to use anything other than my measuring tool to align the fence and blade.
I have to set the front of the blade/fence to the correct cutting distance. Then just one simple step further I set the back of the blade/fence geometry to just one RCH more than the front measurement
The manual for my table saw recommends using a dial indicator and includes instructions, but they also include a secondary set of instructions for using a combination square as a less desirable alternative. I did that, using a good combination square, but was not happy with the results. It just didn't feel right during rip cuts. I was as careful as I could be. I tried to improve the alignment more than once, but it was not working out. To be clear, nothing bad happened. I doubt I was at risk for kickback. It just didn't feel
I wanted to try a dial indicator anyway; sometimes you gotta see for yourself. After making the alignment jig above, I could see the relative misalignment. It was not bad, but there was room for improvement. It was quick and easy to align the table saw to within 1/1000 of an inch. Since then, rip cuts really do feel better. I freely admit that it could be my imagination, but I don't think so.
My reason for posting was to share how easy it is to make a simple, low cost, quick and easy dial indicator alignment jig. The Woodpeckers jigs sell for $90 and $250 (v2.0, eek!). Anyone can build my jig with a $17 dial indicator (useful for many other purposes), a bolt and a knob, and some scrap wood. I doubt I will need to do that alignment again for years, maybe never, but the jig stores small. I can share it with friends who want to try it out.
I was pleased that I found a creative use for those skinny triangle pieces and wanted to show the compression joint, to share the idea with others. That joint could be used in creative ways that I would never think of for myself.
above, I have no idea what RCH means.