trying to get my autogauge digital tacho woring on a perkins diesel engine

October 25, 2006 2:26pm CST
HELP ! can anyone tell me if you have to fit some kind of special kind of sensor to a diesel engine to get the tacho working correctly there is a terminal on the alternator but when i connect this the tacho reads 5100 when the engine is idling! its a 4 cylinder engine and the switch on the gauge is on the 4 any ideas PLEASE 07966276250
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