I believe you need a tach adapter for our vehicles, however somebody in another thread said it is located behind the instrument cluster and is either orange/white wire or tan/yellow, but take that for what it's worth.
If you try searching through some old threads you may find more info.
There are pretty good instructions I have seen floating around here, I couldnt tell ya where off hand but searching will maybe find them, sometimes its a pita to search.
You know, a while back when I watched your post count go over 1000 or so, I thought to myself, "Self, I've never seen a single post by this dude. Where are his posts coming from?"
But tonight, my inner tension caused by your mysterious post count boost disappeared, when I went through 30+ threads, and saw one liners like that in nearly every one.