Re: 59a Engine swap Temperature Sensors.
Only the single terminal is providing the ground to the dash gauge to display temperature. The two terminal sender is just a switch (on/off) that is preset to a temperature. When the points in the two terminal sender are closed it just passes through the ground signal from the one terminal sender. When the two terminal sender exceeds a set value the points open and remove the ground to the gauge which causes it to read full hot.
Last edited by JSeery; 02-24-2020 at 01:06 PM.
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