BJ74 was never sold as LHD
exhaust temp would not make a sticker, you would need a factory pyro installed ... no can do.
In the Japanese catalog I find a reference to a plate that looks very much like the one on the driver's door. It is identified as "PLATE, EXHAUST TEMPERATURE CAUTION", 74517-20020.
Perhaps some version of warning the driver to idle the engine before shut-down after high-load operation?