Line Loc /Brake Warning Light

Will this work! Roll Control wiring install.

Two wires -black to ground and red "activation switch" to any 12V.

I was thinking..and perhaps heard of this before on the forum somewhere. Could I just "tap" into my Brake Warning Light wire? My EM brake "or" port valve has 12V sitting there and if the fluid level were to drop, it would get grounded out showing the warning light at the cluster. So if I were to "tap" into this wire with a "roll contol switch" the warning light on the cluster should come on when activated and ground...? wouldn't it???

Reason: I don't really want to drill any extra holes for more lights in the car.