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that is interesting as the guys on dieselplace say none of them work on our trucks, i think it has something to do with the tach signal coming from the alternator and its not a normal tach pulse
I know that the tach signal is different, it referenced a different way to do it in the manual. Ill look it up in a bit, but im pretty sure the work around for that is to use the sensing tach mode which uses voltage to calculate the tach signal!