[mitchntx]

Glenn has done tons of research on this and we are both about to the point of have custom machining done.

Autometer guages have a sending unit that is 1/8" NPT.
An LS1 motor has ports machined in, but are 12x1.5 metric.

Sure there are adaptors, but the wall is so thin the adaptors twist off with MINIMAL torque. And by that, not enough to crush a seal enough to prevent a leak.

Why don't they make a 12x1.5 sender?????

The stock sender ohms out WAY different ... almost 1K ohms lower than the AM.

[mitchntx]

I took Cory's advice and called Autometer tech ...

With the information given in Cory's post and in front of me, the AM Tech guy didn't have a clue what I was talking about.

He said they had some in prototype and were extremely expensive, but nothing was available to the general public.

I wound up going to a local hydraulic supplier and fining a fitting that had a 20 x1.5 end on it, cutting off the opposite end and tapping the 1/8NPT thread into the altered fitting.

Found a combination of seals and O-rings and sealed it into the oil level sensor port on the pan.