I am 90% complete with my s2000 cluster swap. However, I have a question about the temperature sending unit. In the helms manual lists the following for the sending unit:
133F should measure about 137 ohms of resistance
185F-212F should measure about 46-30 ohms of resistance
It also says that resistance varies from about 137 ohms at low engine temperature to about 30-46 ohms at high engine temperature.
The helms also gives this description:
The engine coolant temperature gauge has two intersecting coils wound around a permanent magnet rotor. Voltage applied to the coils, through fuse 25, generates a magnetic field. The magnetic field, controlled by the engine coolant temperature gauge sending unit, causes the rotor to rotate and the gauge needle to move. As the resistance in the sending unit varies, current through the gauge coils changes. The gauge needle moves toward the coil with the strongest magnetic field.
Question:
How do I go from all of these ohm measurements to millivolts? I have a k-tuned converter (it does speed, temp, fuel, etc). The s2000 cluster has 7 sections which light up (1 lit up is cold, all 7 is very hot). The sections are tied to millivolts. So I have something like the following:
01) 4000mV
02) 0370mV
03) 0124mV
04) 0093mV
05) 0086mV
06) 0072mV
07) 0062mV
How do I adjust these values properly to have the gauge roughly mimic the factory cluster gauge?
133F should measure about 137 ohms of resistance
185F-212F should measure about 46-30 ohms of resistance
It also says that resistance varies from about 137 ohms at low engine temperature to about 30-46 ohms at high engine temperature.
The helms also gives this description:
The engine coolant temperature gauge has two intersecting coils wound around a permanent magnet rotor. Voltage applied to the coils, through fuse 25, generates a magnetic field. The magnetic field, controlled by the engine coolant temperature gauge sending unit, causes the rotor to rotate and the gauge needle to move. As the resistance in the sending unit varies, current through the gauge coils changes. The gauge needle moves toward the coil with the strongest magnetic field.
Question:
How do I go from all of these ohm measurements to millivolts? I have a k-tuned converter (it does speed, temp, fuel, etc). The s2000 cluster has 7 sections which light up (1 lit up is cold, all 7 is very hot). The sections are tied to millivolts. So I have something like the following:
01) 4000mV
02) 0370mV
03) 0124mV
04) 0093mV
05) 0086mV
06) 0072mV
07) 0062mV
How do I adjust these values properly to have the gauge roughly mimic the factory cluster gauge?
