speed governor/limiter bypass

Hi I was wondering if anyone could tell me how exactly to hook up a wire on a caterpillar c15 I know that i should hook it to the wire on the speed sensor that goes to the ecm but where is it best to run that wire from the alternator rpm wire or the crank sensor

 

Yes it is the first truck I've ever owned it is a 2007 freightliner argosy with the c15 in it unfortunately it was owned by a big company and it is stuck doing 99kph the problems I'm having is that I'm getting left behind by other drivers and as I often get out as one of the last trucks at night its stressing me out trying to keep up with eta's and so on

 

The problem with that is a lot of workshops wont do it because of the laws here and ive noticed that when a inspection is carried out by the rta (road transport authority) the plug into the computervto check what the limiter is set at then they check under the truck to make sure the cog on the back of the gearbox hasn't been tampered with but they never check they wiring from the speed sensor which is where i would like to run a wire from

 

It does work because a lot of other drivers use this method