Originally Posted by
channelmaniac
Are you SURE it's connected?
There are 3 temperature devices on the Miata.... one is a switch that sits on top of the thermostat and turns the fans one... two is the one with the green or brown plastic connector that sits at the back of the head and connects to the ECU... three is the one that has a single connector on it that runs the gauges. It is on the back of the head too.
Be sure you are checking the right sensor!
You either have a intermittant 3rd sensor, an intermittant wire, or a bad gauge.
RJ