If they told you that in the block there is a screw draws that screw, see that you effectively have water and put the Ally score, with respect to the tension cables you mention will depend on which voltage worked the marker that you bought if it is with 12 volts, it combines you to remove a cable from battery directly, or in its defect Throwing it to chassis is recommended, the independent installation refers to the fact that you put cables and do not click the cables that the vehicle带来,无论如何,只要您不单击任何传感器,就不会遇到问题。