With the bulb still in it's ice bath take the gauge over to a pot of boiling water.
Unroll the coils made by using your hand and at the same time, put your nose
near your solder joints and drop the bulb into boiling water.
IF YOU SMELL ETHER GAS, REMOVE FROM HEAT, PUT THE BULB BACK IN THE ICE BATH AND CHECK YOUR SOLDER JOINTS.
You'll probably get one more shot at the repair before you've lost too much ether.
If you don't smell gas, CONGRATULATIONS!!
Adjust the gauge as needed so it reads both zero (out of the ice bath) and slightly more than 212 degrees ( in boiling water).