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Originally Posted by Kris_kayton_666
is it possible to install the tach in a cavalier that did not come with a factory one, if so is it possible to put it in with out the adaptor
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yes and yes, however you will need a tach you can set at 2 cylinders, since you will only get half the reading, and you need to splice into 1 wire thats connected to your PCM (computer), with a fair amount of research im sure you can find out which wire it is, but its way easier just to get the tach adaptor (easier, not cheaper)