1. Gauge Indicators (Non-Electronic) Gauges

2. Automotive vehicles use two basic styles

3. Two Styles of Gauges BIMETALLIC GAUGESBIMETALLIC GAUGES –Thermo-electric –Slow Movement –U-Shaped Strip –Free Arm contains a heater. –Heat through coil distorts strip –More Current deflects needle more ELECTROMAGNETIC GAUGESELECTROMAGNETIC GAUGES –Four Types –d’Arsonval –Three-coil –Two-coil –Air core

4. Bimetallic Type

5. Balancing Coil Type Balancing Coil Type

6. THREE COIL GAUGE

7. AIR CORE GAUGE

8. d’ Arsonval Gauge

9. Constant Voltage Regulator Steady 5 voltsSteady 5 volts –Why?

10. TYPICAL TEMP GAUGE

11. FUEL GAUGE SYSTEM

12. SENDING UNITS THREE TYPESTHREE TYPES –THERMISTOR High Engine Temp = Resistance decreasesHigh Engine Temp = Resistance decreases –PIEZORESISTIVE Sensitive to Pressure ChangesSensitive to Pressure Changes Is a variable ResistorIs a variable Resistor –MECHANICAL VARIABLE RESISTOR Contains sliding contactsContains sliding contacts

13. PIEZORESISTIVE SENSOR

14. MECHANICAL VARIBLE RESISTOR

15. OIL PRESSURE WARNING LIGHT SENDING UNIT