Premier L4-150 2.5L (1988)
Oil Pressure Gauge: Description and Operation
Variable Voltage Type
The variable voltage type dash gauge consists of two magnetic coils to which battery voltage is applied. The coils act on the gauge pointer and pull in
opposite directions. One coil is grounded directly to the chassis, while the other coil is grounded through a variable resistor within the sending unit.
Resistance through the sending unit determines current flow through its coil, and therefore pointer position.
When resistance is high in the sending unit, less current is allowed to flow through its coil, causing the gauge pointer to move toward the directly
grounded coil. When resistance in the sending unit decreases, more current is allowed to pass through its coil, increasing the magnetic field. The gauge
pointer is then attracted toward the coil which is grounded through the sending unit.
