1 I could be wrong here and maybe I posted this before. I have a crane ignition and a olds factory tach combo. I found that you can peel back the sheething on the olds tach wire and find a wire there to run a connector with to the aftermarket ignition, I used posi connectors and it is working excellent. I would though suggest that you paint the tach indicator orange for easier visibility. crane did not have a direct way to hook this up so I easily improvised and destroyed nothing. I ran the olds tack parallel with a engine rpm indicator and the two were almost dead on with each other. this is another way to use better technology and our personal rides toghether again.