There was a corporate standard and I'm sure that there still is. It's cheaper when you can make things the same as each other on vehicle models.
What year? For many years approximately 73Ω empty and 10Ω full was the Mopar standard. My best guess would be that yours is similar.
Ford up to 1986 - 73-10 Ohms
Ford 1987 & up - 16-158 Ohms
GM up to 1964 - 0-30 Ohms
GM 1965-1997 - 0-90 Ohms
GM 1998 & up - 40-250 Ohms
Mopar up to 1986 - 73-10 Ohms
AMC 1950-1977 - 73-10 Ohms
Autometer -240-33 Ohms is the most common however other ohm ranges are made
Classic Instruments - 240-33 Ohms (excluding vehicle specific gauge kits which use factory ohm range)
Dolphin - 0-90 Ohms
Dakota Digital - Programmable to work with most Ohm range senders
VDO - 10-180 Ohms
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