The only way I can do this neatly is to connect a function drawand use the property ito set the input style. For example, one CSS property is used here to rotate an input element and set the font size.
$(".dial").knob({
'min':-50,
'max':50,
'draw': function() {
$(this.i).css('transform', 'rotate(180deg)').css('font-size', '10pt');
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="http://anthonyterrien.com/js/jquery.knob.js"></script>
<input type="text" class="dial" data-min="-50" data-max="50" />
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