+1, i don think it's a good ideea but even worst ideea is to turn off the ECU cos then it will not deliver the VSS which is used by the engine management and speedometer(+SLS and ACE if fitted). If you are convinced that it's good for you and insist to have a switch insert one on the return pump relay's circuit cos then the 3 amigos will come on for relay open circuit and the TC is disabled cos it can't work without pump. I's the white/orange wire from C0506 pin 15 at the ECU(see Electrical library - connector views)
				
			 
			
		 
			
				
			
			
				Discovery Td5 (2000), manual, tuned
			
			
		 
	
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