Golf swinging gauge - Techanically any type of recepricating gauge.

Hey all, as i sit here listening to Kesha trying to figure this one out... I realised i need help.. (lol!)

Alright, what I am building is a AFL (australia football) game; there is a section where the character comes up to kick the ball (not physically, the ball is just script controlled).

ALRIGHT!... I have had mixed results in creating a rotation object, i have failed in making it return to start position, let alone getting it to reciprocate.

What I want to build is just a script that will cycle through numbers say -100 to 100 and back again..

When an input is made first time, store the number... when input is made the second time, store that number...

... ? im open to other ideas for this also?

Matty