After Effects Expression Help

Dan's solution matches the sample code given on the linked doc in the YouTube description.

I don't think the tutorial is terrible, It's just way more complicated than it needs to be. I have several similar setups in my collection of saved animation presets for creating gauges and dials that animate automatically, but the animations are all based on the layer in and out points instead of comp length so you can it is easier to set up projects than it is to be changing comp length.

FYI, here's the code from the linked doc:

Expression 5 - Text Layer -> Transform -> Position

angle=degreesToRadians(6*parseInt(name)-180);
radius=effect("Radius")("Slider");
ypos=radius*Math.cos(angle);
xpos=radius*Math.sin(angle);
[xpos+540,ypos+540];

You have square brackets in the first line, where you need parens, like this:

angle=degreesToRadians(6*parseInt(name)-180);
radius=effect("radius")("Slider");
yPosition=radius*Math.cos(angle);
xPosition=radius*Math.sin(angle);
[xPosition+540,yPosition+540];

Pretty bad tutorial, to be honest. Relying on converting a string into a numeric value while at the same time animating the text is bad practice. Instead use a slider to feed the text as well as the angle function. Saves you a whole line of superfluous code and the only extra provision on the text layer would have to be a .toFixed() or Math.round() to get rid of decimal values. Point in case: The whole setup shown in the video is designed wrongly from the ground up with regards to how expressions work in AE.

Mylenium