Free Degree wheel.

Free is good, right? I was looking for a degree wheel, and this one should work nicely. Print it out on nice paper and stick it to some sheet metal. Cheap and good.

http://www.ocf.berkeley.edu/~tee/ramva/degreewheel.pdf

I used an old CD and made an alloy adapter, worked quite well and cheap enough for anyone. Of course it's not meant to be used with a running engine, but it allowed me to make marks at the right place and I used those when the engine ran.

Jean

Love the DIY disc but off the shelf are cheap and lasting stable to handle and store.
Here's what DynoDave makes to hold em on though don't take much if ya don't touch em.