This is funny, I thought I was on some banished list because no one had posted a reply to my question when it was only no one understood what TLI meant.
OK Guys here you go.
TLI = Tank Level Indicator, TLI is a universal term used in the commericial/Naval ship world that represents ANY unit or components used to measure liquid / volume in a tank. (Remember I retired from Norfolk Naval Shipyard engineering department) I had to deal with TLI's (and 9 million other things, the structural division for submarines was known as the REDHEADED Step Children of engineering) in my line of work.
TLI is either electrical or mechanical. The one tsubaki showed in his post is a low grade unit that only lets you know if the tank/container is full. It cannot give incremential levels.
My TLI is the sending unit int the gas tank. I took mine out and went up to my local marine guy and he ordered me one like what I have. I'm putting it in today.
But thanks for responding as I said I thought I was on a blacksheep list.

Lee "garage"
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1991 V-20 cuddy I/O 350 volvo duo prop, 1998 15ft Grumman 9.9 Johnson