I have a battery isolater the problem is I have to use jumper cables the way you have hook up your second battery that if a draw happen you wood loose both batteries I have not done it yet but I think a boat battery switch should work off bat 1 both or dat 2 you would still need an isolator to...
The 84 and up C and K 10 1/2 ton gas smog truck have that light the have a ECU and a computer controlled carb the 20 and 30 we're not computer controlled. The bezel I have not found one with the light window post it here if you find one
You can get a flex plate (fly wheel) for the one peace seal cranks that will work with a th350 or th400 from Summit or Jegs if you need a new flex plate
If I under stand it 73 to 80 the switch changes the sending unit to the Gage in the 81 to 87 the switching vavle under the truck switches sending unit to the Gage
Ok thanks all for the responses I was going to put on a pic but spaced it out I guess this light you grab it has a cord and when you pull it off the fire wall it comes on and you put it back it goes off Thanks again