for the simplest install and most accurate reading, i would go on the drivers side exhaust manifold. drill and tap the hole about 1.5 to two inches in front of where the manifold ends and the Y pipe bolts up.....it is an easy place to drill on the truck as long as you are VERY carefull with metal shavings. Get a small container of greace or vasoline.....tip the bit in it and drill your hole. Then after a couple seconds, clean the bit and re apply the grease till the hole is drilled. Then do the same with the tap. I would clean the tapp back off about every half turn. Get a small magnet up in there periodically as well to catch as much as possible and you should be fine......just take your time and dont rush it.