If you don't know what you're doing, leave your truck well enough alone.... I'm such a yahoo, yall should really just ban me from this site right now.. Well, I pulled the distributor off (thought it would be ok becaues I had done it before on another motor)... Got the old oil sensor off and started screwing the new one on.. I was so happy.. I tightened it all the way down to the block and decided to SNUG it up a little with just two fingers against my wrench.... Well, I stripped the fine threads on the block and the new sensor just spins around and around.. I was a little disheartened to say the least, but said what the heck. I'll just try to finish the install and see how bad it leaks.. Well the distributor wouldn't really slide back down all the way against the block. after wrestling with it I got it back on.. then I finished putting the line on the gauge went to crank the truck and it wasn't firing, and the starter was grinding every now and then... well, it never fired, but it backfired like a shotgun out the exhaust.. BANG dicided I would try to crank it one more time, then it backfired a bunch of white smoke through the carb POOF and I might have dropped a wee bit of crap down the sensor hole... I am Mr. BEAN in the flesh (You know when he messes up the painting).. I have NO business touching a vehicle ever again.. I hate me and you should too.