Stop using your old broken temperature gauge on your grill and get a replacement part already! If you've got a Broil King barbecue and your current heat indicator is broken, then this replacement will do the trick. It will fit right into the Broil King nameplate and will read up to 700°F (or 350°C).
It won't even take a rocket scientist to install. Simply unscrew the pre-existing temperature gauge from the inside of the barbecue lid and make sure to keep the nameplate intact. Then, slot in the new temperature gauge and tighten it firmly. With a brand new temperature gauge, you'll know just when its optimal time for searing your steaks or smoking your meat.