sentross94

HI
I JUST BOUGHT A REGULAR AUTOMETER TACH FROM AUTO ZONE FOR LIKE 30 BUCKS.IT TELLS ME TO INSTALL RED TO BATTERY,BLACK TO GROUND,WHITE TO DIMMER SWITCH,AND GREEN TO I DON'T REMEMBER WHERE TO.
MY QUESTION IS THIS: THERE ARE TWO FUSE BOXES IN THE CAR:ONE INSIDE THE CAR,AND ONE UNDER HOOD.WHICH ONE DO I CONNECT THE WIRES TO,AND COULD SOMEONE PLEASE PROVIDE ME WITH COMPLETE,DETAILED INFO ON INSTALLATION OF THIS THING-I DO NOT WANT TO SCREW ANYTHING UP.
THANKS IN ADVANCE.
SENTROSS94