Yep, that's the gas filter (see the schematic; it's labeled there). The base of it is threaded into the intake manifold and sees manifold vacuum. My '77 setup doesn't have a temperature sensor anywhere; maybe the California models did. I think '78 and newer did as well; my carb has a temperature sending unit on it, I think for the carb cooling fan.
Rising Sun Bio
2F "Brahma" + Lockright, tach, Warn 8274, FJ60 Power Steering,
no more Sanden OBA
1FZ-FE factory lockers +
Safari intercooled turbo, CDL switch, cup holder, Metric TLC leather, heated seats, JDM switches, PUMA OBA.
Warn M12000 waiting for a bumper.
Limited TRD 2UZ-FE SOLD