Temperature Gauge

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Datsun 1200 comes with a full temperature gauge in the dash, controlled electrically by the Thermal Transmitter (sender) that is screwed into the cylinder head.

Instrument Panel Gauge

Also see:

• Water Temperature Gauge in Instruments and Controls
• Radiator, section Temperature

Dash gauge. It is not unusual with any 10-year old stock radiator for the temperature to rise during summer. If you have this, don't panic. The engine can run all day close to the "H" mark. Just don't let it go over that.

Normal Temperature

According to Owner's Manual: Water Temperature Gauge, this is the normal range.

Normal Range

Part Number

• 24880-H1000 GAUGE-water temperature JDM [kaku]
• 24880-H1000 GAUGE-water temperature B120 -7803
• 24880-H1800 GAUGE-water temperature JDM [maru]
• 24880-H1800 GAUGE-water temperature B120 7804-
• 24880-H1800 GAUGE-WATER TEMP USA [round gauge]
• 24880-H3100 GAUGE-water 1972 JDM

• 24880-H5500 INDICATOR ASS'Y-water temperature JDM B210

Voltage Regulator

The instrument panel voltage regulator is integrated with the Temperature Guage and is not sold separately. This regulates:

• temperature gauge
• fuel gauge

• 24880-H1000 METER ASSY-WATER TEMPERATURE -7803
  • For round and rectangle gauge panels
• 24880-H3100 Gauge W/temp 7804- $50.60 USD
  • also used by 620 truck 1972-1979

Thermal Transmitter

The temperature sender (sensor) is called the thermal transmitter. If varies resistance according to temperature.

Switch for Temperature Gauge (thermal transmitter)

• Nissan 25080-89900 GAUGE-TEMP ENGINE UNIT
  • 25251-30100 NUT [Threads for engine unit]

    required. You can re-use your old one.

• BECK/ARNLEY 2010247 $8.16
• Airtex 1T1181
• STANDARD MOTOR PRODUCTS TS69
• ACDELCO E8041, 19107020

Rockauto.com

Interchange

1971-1973 1200
1973-1976 610
1968-1970 1600 Roadster
1975-1979 620 
1968-1970 2000 Roadster
1972-1974 620Pickup
1977-1983 200SX
1974-1977 710
1987-1988 200SX
1980-1985 720
1979-1982 210
1977-1979 810
1970-1973 240Z
1981 810
1974-1975 260Z
1974-1978 B210
1975-1978 280Z
1986 D21 Pickup
1979-1983 280ZX
1976-1978 F10
1980-1982 310
1982-1983 Maxima
1968-1973 510
1983-1986 PulsarNX
1978-1981 510
1983 Sentra
1968 520 Pickup
1982-1986 Stanza
1969-1972 521 Pickup

Part Numbers:

• 25080-89900 GAUGE-TEMP ENGINE UNIT
  • Beck/Arnley 2010247 Water Temperature Switch $17.49 at schucks.com
  • Standard Motor Products TS69 Engine Coolant Temperature Sender
• 25251-30100 NUT

Transmitter is at very front of right side

Tranmitter at left side, pointing up> it has a threaded collar nut to hold it in.

Transmitter at right front corner of head (in the photo: left side of front of head)

Troubleshooting

First, clean the connections of the wire to the thermal transmitter (engine temp sensor).

Yellow wire just about hose clamp
Remove the wire and clean the connector. Replace. Make sure the wire fits tight.

• If both fuel and temperature gauges do not work at all, the fuse is likely burnt out. Inspect the fuse. If the fuse is good, the instrument panel voltage regulator may be bad

• If both fuel gauge and temperature gauge read incorrectly (high or low) or fluctuate, the problem is likely the shared instrument panel voltage regulator. But first check the wiring connections. They may be loose or corroded.

• If gauge reads MAX hot with ignition OFF, gauge is defective.

• If gauge reads MAX hot with ignition ON, but cold with ignition OFF, transmitter is bad

• Ground sensor wire at engine. If gauge fluctuates, gauge is bad

Accuracy Test

• Buy a 116-ohm resistor at Radio Shack or other electronics store.

1. At the engine, locate the thermal transmitter:

2. Pull the wire off the transmitter and put a 116-ohm resistor from the wire to earth/ground
3. Turn IGN switch to "ON". Gauge should read 50C/122F, or between C and H ranges (in middle range)