Check the listing for details. New Stewart Warner Pyrometer Thermocouple 598366091 exhaust temperature gauge. Condition: New other (see details). Listed at 27.95 USD. You are purchasing a new Stewart-Warner # 598366091 pyrometer thermocouple model 323-E. This gauge sending unit will provide precise exhaust temperature data to protect the engine in your big rig or diesel marine boat. Fits many International Truck, Kenworth, Peterbilt, Mack Trucks, others but not every application. Also used in many Marine, boat applications with diesel marine engine. You need to match yours up to my photos to be sure the tube length and connectors are correct. Always double check your parts book or parts dealer to be sure the item fits your vehicle before purchasing. Please check out our other auctions and Ebay store. G15E3 USA buyer will pay $9.00 U.S. Priority Mail 2-3 day shipping and handling charge.