Originally Posted By earlymopar
The only problem I see with a mechanical water temp gauge is the size of the sending unit which requires a corresponding large hole in the firewall.

Mechanical oil pressure gauges do not bring hot oil into the car interior. In any I have had, the oil runs a couple of inches into the tube (still in the engine bay) and the rest of the tube is pressurized air which is what drives the gauge.

- EM


Let the line break at the gauge and see what happens.