The std wide band formula should work as its out put is 0-5volt and most read 10-20afr. You still will need to tweak the formula for your car to account for voltage drops or any other resistance. The std formula is voltage *2 the. You add 10. You then compare your logger to your actual wide band and make sure they are the same. You may have to add 10.1 ect to get them the read the same