2. Measure the resistance between the connecting terminals with an ohmmeter (Figure 15.6a, b). Nominal resistance value:
- between power source and ground: 187±18.7 Ohm
- between power source and coolant temperature gauge: 90±4.5 Ohm
- between coolant temperature gauge and ground: 247±24.7 Ohm
Figure 15.6a. Checking the resistance of the coolant temperature gauge (vehicles with a tachometer) | 
Figure 15.6b. Checking the resistance of the coolant temperature gauge (cars without a tachometer) |