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			It 18 tpi, so as Alex said, NPT. It appears to be a parrallel thread, as your picture and mine have a copper washer under them. These things go on the hole size for volume flow, so it will be 1/4 NPT (BSP is 19 tpi)  The other end fits the ford sender.
		 
		
		
		
		
		
		
			
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	Bluebell Carrier Armoured O.P. No1 Mk3 W. T84991 Carrier Bren No2.Mk.I. NewZealand Railways. NZR.6. Dodge WC55. 37mm Gun Motor Carriage M6 Jeep Mb #135668 So many questions....  | 
		
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