Fuel gauge & sender resistance issue. HELP

1969 Valiant.

I want to use my stock fuel level gauge with my after market fuel cell sender unit.

My understanding is that the stock system operates in a range of 0 to 60 ohms. Is that correct?

My fuel cell sender unit has a range of 0 to 90 ohms. Whay can I do to make it work accuratly?

Thank you