Negative Pressure in Kiln / Afterburner?

Use tubing to carry the pressure out to to a friendlier location. At 1700°C, you might have to use ceramic tubing.

Since you are measuring vacuum if all goes right the heated gas does not get to the gage. Like dkwarner said connect it with a length of tubing. I have several vacuum sensors in a similar application that work fine. The tubing should be long enough or of a material so as to not conduct the heat to the gage. With a length of small tubing and no leaks at the gage this could maybe even tolerate short times at a positive pressure.

Attention: Ceramics have in general a high thermal conductivity so that the length has to be quite big till you reach an acceptable temperature.

The best solution could be a double tube with an air cooling flow between the two components and at the end a tube of SS which has a lower thermal conductivity and could be shorter. To make it shorter you could use fins when the tube is outside of the hot chamber.