/\/\/\-like SSC

I've been trying this for about months now, but I can't get a scope to reverse when it goes off limits, like:

|--------|

| /\  /\ |

|/  \/  \| 

|--------|

Using a sine would slow it down at the tops, and my attempts with if(above(below... failed all

Some help would be appreciated.

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Another thing, maybe i should post another thread, but ah well, let's try to keep the first part short.

With the attached preset (note: not finished), I can't get the speedometers to follow the circle. If someone could help me with that, I'd like that too.

You aren't following the same equations for the circles and the lines. Look at Atero's primer. It has an example of rotating things.

Attached is how to change a sine into a zig-zag line.

a simple way to do that is to use the asin/sin combination, which easily reverses/reflects images:
x=asin(sin(x*pi))/pi; y=...