No Temperature

I'm not getting a temperature reading on my gauge for my coolant. Why could this be? I just had a full extensive tune up with new ignition coil and module.

I'm not getting a temperature reading on my gauge for my coolant. Why could this be? I just had a full extensive tune up with new ignition coil and module.

Did you check the sending unit to ensure the wire is still on it? Sounds like it could have been knocked off. The sending unit is on the cylinder head between either the #1 and #3 spark plug, or between the #6 & #8 spark plug.

In addition to the good advice Si offered, you can ground the green wire from this sending unit anywhere on the engine. Turn the ignition switch to RUN and observe the temperature gauge - It should sweep to the full HOT position or slightly beyond. If not, there may be a wiring, instrument, or GAGE fuse problem. If the gauge does sweep full hot with the wire gounded, but still doesn't work with the wire connected to the sending unit, test the resistance of the sending unit connector to ground and compare it to the table:

http://72.19.213.157/files/CTSMAT.gif

What Kind Of Tool Is Used To Test The Resistance? And What Does That Tell You?