You mean a loop?
Create called by other action block (anywhere in the editor that you can create actions). & inside of that add a pause action part, set it to 1000ms. Next add the set value action part, then add a jump to x action part (leave it as absolute & #1). Job done, you've created a looping action block that updates a value every 1000ms (1 seconds).
Finally you will need to call that action block at beginning of each scene probably otherwise when you load a save file it won't automatically start it looping.