2-1/16" WATER TEMPERATURE, 100-250 °F, AIR-CORE, AMERICAN MUSCLE

Thank you for your question. The depth of this gauge is 1" 11/16. You can see full dimensions on our website at: https://www.autometer.com/pub/media/manual/dimensions2014.pdf

Hi Morris, the American Muscle features long-life, internal, circuit-board mounted LEDs. They are not accessible or replaceable without sending in for service.

Thank you for your question. This gauge will work with your application but you will need to use the sending unit provided with it.

Hi Bobbit, Unfortunately this American Muscle gauge is only available in degrees F. Thanks, Jim

Thank you for your question. No, the sending unit is what tells the gauge what to display. Without it the gauge will constantly have no signal and it will not work.

Hi Carl, thank you so much for contacting us. The 2259 is completely interchangeable with the 2258, so no issues there. Your infrared gun is only measuring surface temp which tends to be between 10%-20% lower than the actual fluid temp that your gauge is reading. It is not a reliable indication of the accuracy of a gauge. The first thing I'd look at is the ground for the gauge itself. A temp gauge reads over a very wide resistance scale and references that ground when it measures. Any additional resistance or interference to ground will cause the gauge to read erroneously high. Also, we separate out the ground circuit for the gauge and the gauge lights for a reason. If they are tied together your gauge will almost definitely read high. To test, take the ground wire from the gauge itself and connect it to a good engine or chassis ground. Do not use anything inside the cabin, don't share the ground with other consumers and definitely don't connect it to the battery. Chances are the issue goes away, though the spread isn't far from what I'd personally expect to see between a temp gauge and an IR gun. For more info on this, check out this article we wrote: https://www.autometer.com/resources/index/faq_view/id/11 Hope this helps!