Depending on the age of the 1500 series Sportsman incubators I believe the wafer is there as a back up to be plugged in in case of a failure of the electronic thermostat. They are an either-or setup. They are not wired in series like the older 1200 series. Refer to the instruction link I sent on the other thread and you will see what I mean. If you find that your thermostats do have the ability to be unplugged and you are unable to dial it in with the electronic one then unplug the electronic and plug in the wafer.
Carefully turn it in clockwise till you hear it click and the pilot light goes off. Back it out about 6 turns and watch the thermometer. When the temp hits 99.5 turn the stem in til the light goes off with a click. If it clicks off before reaching 99.5 then turn it out till desired temp is reached. Watch the temp rise and fall through a few cycles and fine tune it as necessary.
hth, db
Carefully turn it in clockwise till you hear it click and the pilot light goes off. Back it out about 6 turns and watch the thermometer. When the temp hits 99.5 turn the stem in til the light goes off with a click. If it clicks off before reaching 99.5 then turn it out till desired temp is reached. Watch the temp rise and fall through a few cycles and fine tune it as necessary.
hth, db