RootesRacer
Donation Time
Jarrid,
Since the Alpine gauges are based on resistive heating elements and bi-metal strips (unlike most gauges), knowing the gauge resistance and the sender resistance would allow calculating the series current at a given voltage.
Having said that, a chart of actual current vs. gauge reading would be very interesting. Confirmation that the fuel and temperature gauges exhibit the same response would also be nice to have.
The meters are too fast to be bi-metal.
Since they are also polarity insensitive, I suspect its a simple galvanometer with the counter field also produced by the impulse current.