I have some new lines being made and new block adapter and I'm going to drill and tap the oil filter plug on the remote housing coming into the filter and before cooler for the sender

I plan to run a second set innpan this year, also at oil filter adaptor and have it on a switch to see both readings for the heck of it, as far as using a t, don't use any brass nipples from block to T, use black pipe, ask me how I know lol

Whats the issue FF false readings ?? Mercury uses a brass T fitting

I've heard of people doing the same thing. btw.... for those who are curious see below.

What's strange is what are the senders made of???

It states right on Livorsi's web site not to use any sealant or Teflon tap on their senders ( metal to metal ) I would bet most guys do

The T is fine. But don't use a nipple made of brass between them, I snapped one on my trans last fall cost me a trans ...if not rough water may not be an issue but I donrough wayer abuse a lot

I am looking for the picture to show you what I'm talking about but I can't find it

We've all done it at one time or another. Sometimes it will work and some not. But ya they make it very clear on their website and the instructions that you pitch in the trash prior to install.