Coolant temp gauge doesn't show any movement

[Roger Milne]

So I took the unit out for a drive and albeit not more than an hour roundtrip, but my coolant temp gauge barely registered any movement. All the other pressure and temps all read fine, but I was wondering if there's an easy way to check the gauge or if I need to replace the temp sender in the engine block?
I bought this last year and drove it for a few hours before we parked it and have lived in it for the past 8 months and if I recall it did read although it was what appeared very cool. Not in the middle of the gauge like everything else.

Any suggestions??

[Steve Huber]

Roger,
The sensor output should be a resistive value so you should be able to check the gauge by applying an open and or a ground to the gauge input and see the gauge respond. The engine coolant sensor location is shown in Coach Assist / CAT & Allison Manuals / C9 Sensor Location Diagram/Part#s.
Steve

[Roger Milne]

Oh Ok thanks Steve,

I'll see what I can do to ge the gauge off the peg and I'll go over the manuals you mentioned.