Вам необходимо установить ширину области датчика. Справочник по API для него.
<script>
$(document).ready(function() {
$("#gauge").kendoLinearGauge({
gaugeArea:{
width:500
},
pointer: [{
value: 670000,
shape: "arrow",
color: "black"
}, {
value: 480000,
color: "blue",
shape: "arrow"
}, {
value: 570000,
size: 15,
color: "blue",
shape: "arrow"
}],
scale: {
min: 470000,
max: 770000,
vertical: false,
ranges: [{
from: 470000,
to: 470500,
color: "#c20000"
},{
from: 470500,
to: 471000,
color: "yellow"
}, {
from: 771500,
to: 770500,
color: "yellow"
}, {
from: 770500,
to: 770000,
color: "#c20000"
}]
}
});
});
</script>