"Piece of cake " my butt!
First of all, with the speedo cable removed from the firewall hole, I was still unable to pull the temp sending unit nut through the hole as the plastic heater vent is right behind the hole in the dash and you can't get a straight shot at working the nut through. Had to pull out the Dremel and make the hole larger. Now I can pull it through. Oh, and by the way, the installer routed the original line over the intake manifold, and around the alternator on its way to the remote
oil filter location. As I am working it out from around the alternator, I touched a hot lead and quite a nice spark shot out. Later, as I am pulling the coil through the firewall hole, the end unit breaks off at the point where the wire touched the hot lead to the alternator. Removal was easy after the end broke off.
So, now I can't send the non working unit back to Nisonger for warranty credit. It's in two pieces!
Installed the new one through the bigger firewall hole and re routed it along the driver's side to the remote
oil filter, thus avoiding all engine vibration and heat. Lubed the speedo cable while I was at it to see if I could kill that needle hop.
If it happens again, I'm all set!