The SV stock doesnt have a fuel gauge, rather just an idiot light to tell when level reaches point X and then again at point Y.
I've only seen where people have adapted the stock fuel level sensor to aftermarket gauges like seen here: http://forum.svrider.com/showpost.php?p=697444&postcount=79
You'd have to rig up the new fuel gauge to work like the stock unit. Otherwise you'll be installing a whole other sensor in place of the stock SV unit, as well as trying to come up with the appropriate fuel levels.
I've only seen where people have adapted the stock fuel level sensor to aftermarket gauges like seen here: http://forum.svrider.com/showpost.php?p=697444&postcount=79
You'd have to rig up the new fuel gauge to work like the stock unit. Otherwise you'll be installing a whole other sensor in place of the stock SV unit, as well as trying to come up with the appropriate fuel levels.