For electrically operated temp gauge, check the power supplying it. Most often, this is connected
to either the accessory fuse or front dashboard
instrument panel, check for busted fuse at the
fusebox. If every fuse is okey, then your temp
gauge needs replacement.
Temperature sending unit wire may be disconnected or unit failed (broken).
The sending unit is on top of the engine and looks like an over-grown sparkplug.
Work the electrical connection on iot and start engine to see if the temp is registering.
Replace unit ($13) if not working. There is no fuse for this.
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