Edit in JSFiddle

define(['ojs/ojcore', 'knockout', 'ojs/ojknockout', 'ojs/ojgauge'], function (oj, ko) {
    return function cskojGaugeDemo(val) {
		var self = this;
 		self.cskValue = ko.observable(val);
		
		self.cskValue.subscribe(function(newValue) {
    		eval("addchg_" + cskGetFormName() + "(document.getElementById('CSK_PERCENT'))");
		});

    };
});