i wanna put a tach in my 73 but i would have no clue where to mount it, could i rig it to mount in the dash cluster where the dummy lights are, sence they dont workanymore anyway, i converted to gages and like them alot better but there mounted under the wiper switch, i probley wont put a tach in the car till i convert it to a t5 or something but i would like to know what all needs done