No experience on a Series 1 but I had one on another vehicle - it was not programmable and you just selected one of 16 programs in the dizzy.  Easily set up but I had to remove mine on advice of my tuner as it was all over the place and none of the programs was suitable.
However they are often fitted to 6 cylinder Jags and apparently work really well.
Garry
				
			 
			
		 
			
				
			
			
				REMLR 243
2007 Range Rover Sport TDV6
1977 FC 101 
1976 Jaguar XJ12C
1973 Haflinger AP700
1971 Jaguar V12 E-Type Series 3 Roadster
1957 Series 1 88"
1957 Series 1 88" Station Wagon
			
			
		 
	
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