Ridley is right, those red lines on the dash are for "trim" setting of each control. Rudder trim default is "J" and "L" on the keyboard I believe. The only reason you'll see those move, is because you have "combat trim" on and the plane is automatically trimming the plane for you.
To check your rudder control on your twisty stick, goto options/controls/map controller. On that page of the clipboard, highlight your stick in the "Select control" box in the top right, "click" the "advance" box, then highlight the "Z rotation" I think its called. With the advanced box checked it will open another flip out page and show you the scaling and a raw view of your control. twisting your stick should show a line running up and down in the blue boxes.
At rest the line should be in the middle, twisting one way runs the line up, the other down. If your stick returns to "center" physically, the lines should center too. If they don't, click the calibrat axis button and calibrater your rudder.
Good luck!