Rally dash gauge voltage. 5v or 6v nominal?
Yes!
One thing to look at is the current or wattage draw.
(Just using 100 ohms as a number)
5V/100ohms = 0.05A power = 5W
6V/100ohms = 0.06A power = 6W
The higher the wattage the farther the gauge will move. (The heater coil gets hotter and the bimetal bends more)