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Defender rev counter


Bluemoon
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I've got a Defender rev counter, ( in my Defender 300dti) being on about 2 years, but I've just upgraded my alternator from a Disco 300. now my revs show a lower reading. There's three terminals on the back of the rev counter earth, positive and input. Is it something I've just got to live with or is there a fix. cheers for any help

Brian

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if there's 3 small white slide switches on the back do this ---->>>> move the 3 slides so you get 1 & 3 up & 2 down, then refit & check the idle rpm it should read 750 to 800rpm & max rpm should be around 3850rpm.

Is that the back of the tacho or back of the alternator?

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