I'm not so sure. Ask that guy about the adapter and how it works, if you can find out the essentials, I'm sure you can simulate the whole thing to get it to work. Maybe someone else that has a Aftermarket tach can help you. However, if it comes down to fabricating it yourself, i would lean toward the adapter. Do you know exactly how much it is? 15-20 Bucks doesn't seem so much to me, but if it's more then screw it.