The negative side of the coil is where you get the tach signal from. Take a look at it, use a test light to find the hot side, then you know the other side is negative. Thats how its done on early automobiles. Newer EFI vehicles have an IGN terminal by the diagnostic datalink(pre OBD2).

 

For a speedometer you can get a trailtech computer like I have, or if you feel like doing a little rigging to save money, you can even get a speedometer for a bicycle (probably $15), it works the same way. For a tachometer, the only one I ever came across(i've been looking for a while) is this one : 8000 rpm tach, but I still have a couple concerns about it. First, i'm not sure how high the warrior revs. I don't think it goes past 8000 rpm, but it might. The other thing is that the tach is designed for a car, so it's not going to be waterproof, and it might not be very rugged. I don't think it would be too hard to waterproof it, i've waterproofed an automotive voltmeter to use when I had my honda recon with a little hot glue and some electrical tape, and when I was done it could be completely drowned in water and stay dry inside it. It would have to be mounted somewhere where it wouldn't get battered by tree branches and stuff like that, and I don't know if it would stand up to the jarring and vibrations. I guess the only way to find out is for someone to give it a try.

 

i know of a little digital rpm tach works great for 4 and 2 strokes used it on my cr500 go kart and friends use it for there 450 go-karts. pm me for info

 

digital tachs have a big time delay though, so they kinda suck for quick revving motors

 

Depends what your using it for, Trying to shift at a certain point or use it for a rpm recall which is what we used it for.

 

Recall would be fine, so would finding idle. But trying to use it for a shift point brings back the importance of that pesky delay.

 

Better Tach!!!!!!!!!!!!!

 

It works with 1 cyclinder's too! By the way, how high can the 2006 YFZ450 rev up too?

 

I found that one too, but it's twice as expensive as the one I just linked, and a 5' tach is going to look way out of place on an atv.

 

Somewhere in the upper 10's or 11's I believe. I've got a feeling that tach wouldnt take the vibration for long.