Coolant temperature gauge
The device operates in conjunction with a sensor installed in the cylinder head. With a sensor resistance of 700 ohms, the arrow should be at the beginning of the scale, and with a resistance of 77-89 ohms, at the beginning of the red section of the scale.
Fuel gauge
The device works in tandem with a sensor installed in the fuel tank. The same sensor turns on the fuel reserve warning lamp if there are 4-6 liters of gasoline left in the tank. With a sensor resistance of 238-262 ohms, the needle should be at the beginning of the scale, with a resistance of 59-71 ohms - in the middle of the scale, and with a sensor resistance of 17-23 ohms - it should deviate to the end of the scale (mark 1).
Speedometer
Check the speedometer by rotating its drive shaft at different speeds. The verification data is shown in Table 7-6.
Table 7-6. Data for checking the speedometer
| Drive shaft speed, min-1 | Speedometer readings, km/h |
| 500 | 31-35 |
| 1000 | 62-66,5 |
| 1500 | 93-98 |
| 2000 | 124-130 |
| 2500 | 155-161,5 |
Tachometer
The principle of operation of the tachometer is based on measuring the frequency of the voltage pulses in the primary circuit of the engine ignition system.
The tachometer is checked on a stand that simulates the ignition system of a car. Having connected the tachometer to the stand circuit in the same way as on a car, set the voltage in the primary circuit to 14 V and the gap in the stand arrester to 7 mm. Rotate the ignition distributor shaft at such a speed that the tachometer needle reaches one of the main divisions of the scale. At this point, check that the sensor-distributor shaft speed deviation is within +250 min-1 and -70 min-1.
Voltmeter
The voltmeter was used in the instrument cluster until 1996, and then was replaced by a battery charge warning lamp, the switching circuit of which is shown in rice. 7-4.
For testing, the voltmeter is energized from a regulated power source. At voltages less than (11,3±0,35) The LED on the voltmeter should be on constantly. When the voltage is within (11,3±0,35) In to (16±0,35) B, the LED should not be on. At voltages over (16±0,35) The LED should blink. The time delay of the voltmeter is approximately 5 s.