No problem. Here is a pretty stripped-down example that has a timer (sticking with my "gameTimer" example), and 2 parameters involved with setting the current time (one for minutes and one for seconds). You can copy and paste the example into a new Custom Panel *.grid file and it should run for you.
params.setValue('p.display', 0, event.getDisplay());
The important part is the script in the "Set" button that pulls the values out of the 2 parameters and sets the timer's value:
var minutes = params.getValue('p.minutes', 0);
var seconds = params.getValue('p.seconds', 0);
ogscript.getTimerManager().getTimer('gameTimer').setTime((minutes * 60 + seconds) * 1000);#DashBoard