an original gauge requires a 30 ohm sender, aftermarket universal type senders come in various ratings from 30 ohms to 250 ohms as 3B says, if you have the correct 30 ohm sender, it likely just needs to be adjusted properly to fit the non-original tank you have - here's some info and pictures on setting it up

Bill


Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics