Where can I hook up an electric choke?

I really like what that replicarracer43 but my concern is the oil sending unit is 5v (I'm pretty sure) and whats going to happen wben i run a 12v circut through .....anyone have any input on this?
The oil pressure sending unit is a pressure switch...it's not a "5 volt" circuit... one lug gets grounded when there is NO oil pressure, that turns on the light... the other 2 terminals are "normally open" and become "closed" when there IS oil pressure....you put 12 volts fused to one side, the other to choke coil...easy peasy