This listing is for AutoMeter 5831 Phantom Water Temp Gauge 140-280 Performance.  This works.  I am unsure of the model number but researched and believe it is #5831.  This is 2 3/4" diameter at the widest point.  Changed some things on my car so I no longer need this.  Please look at the pictures and ask questions prior to buying.  It is being sold as pictured.

I am not an expert and I do describe as accurately as I can.  If you have questions, please ask what else you might like. Your satisfaction and positive feedback is important to us, so please contact us if your experience has been less than positive so that we can do our best to fix it. We do NOT accept returns on this item.

Thank you.