Can anyone help me please. I just purchased a 5 inch Carter tachometer that reads water,oil, temperature pressure gauge. I'm trying to install it in my 1968 plymouth fury 3 with a 383 in it. I'm wondering do I leave the the old oil sensor/dummy light in there? And put the new one in there on the other side or do just install the new one without the old sensor. Thanks in advance for the help.