aftermarket overheat protection ... they're everywhere:
http://www.fwmurphy.co.uk/company/history.htm
http://www.macquarrie.com.au/gauges/murphy

an interesting item for some uses, particularly stationary engines - maybe your jeep saw some farm use in a previous life

Bill


Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics