Thanks madvk.
I'm pretty handy with computers and electronics, but I'm just starting out when it comes to cars and mechanical engines. Thanks to this guide, I've (hopefully) solved my stalling problem. Nothing like coming to a dead stop just as you're about to enter westgate freeway with a trailer in tow to give you the motivation to try and fix the car.
Getting the balancer off was a huge task in itself. Felt like it was welded on. I haven't done any work on cars, so all I have is the variety of tools my dad left behind. Didn't have a breaker bar, but I did have a 24mm socket generally used in plumbing, so I used that. First bar I used with it bent. Second bar I placed inside two RHS. The engine turned that into a tent peg. a 12mm round solid piece of steel, bent in the strongest part of the rod.
Using a chisel I widened the hole in the side of the socket to accomodate a 15mm steel rod. Then I put it inside the RHS like before, as if it bent I would be out of things to use. Last of all, I sprayed the bolt with wd40 and used a pipe welding torch to apply heat to it, just until it started to faintly smell of burning rubber.
That did the trick for me, and the bolt came off.
For any others trying this on a VS, you will need 1/4" bolts, not 1/2". I bought both. The washers are a good call. Minimum length of the bolts is 60mm, but up to 100mm should fit.
Also, when the guide says apply force to the pulley bolt in order to remove the belt, that does not mean you need to undo the bolt. I tried that, and obviosly it hasn't been removed in years, as it was really stuck. I tried harder, and the head sheared off.
Now I have to remove the bolt somehow, probably drilling into it and tapping another hole, and find a replacement.
As for the sensor, I was able to find one advertised as "genuine" on ebay from a guy who lives close by. $30
When putting it back on, it says to use silicon sealant. I'm guessing that is RTV Silicone Adhesive Sealant? Hope so
In more recent news, I called up holden, replacement tensioner bolt was $20. Went to Jolly Roger u pull it, and got a replacement cheaper. Removed the bolt stub by drilling a hole into it, sticking a smaller bolt into it and then arc welding them together. Then undoing it is a snap.
The fan belt diagram in the first post is not applicable to VS. Here is an image
that i used