Please help me out with gauges
2nd....most senders are 1/8"
P.S. alot of times you'll find a port just above the filter, I'm not sure about the LS1 though but it's worth a look. I would be concerned about using the oil pan bolt location. I wouldn't want a big sender and wire protruding from there! It would make for an easy target for a rock or debris to catch. No need to explain why that would b a prob.
This one maybe? http://xse.com/leres/ss/gaugepod.html
I'm sure you can install it in the drain plug, but do you really want to.?

