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Quick Specs

  • Size:2-1/16" (52.4mm)
  • Type:Air-Core
  • Range:100-250 °F
  • Lighting:Incandescent
  • Instructions: Download PDF


A high water temp can be detrimental to an engine. Heat is the enemy of performance and reliability. Keep tabs on your temps with the most trusted water temperature gauge on the market. AutoMeter’s advanced 1/8” NPT temperature transducer is included for a simple installation on any application.

Feature Points
  • Traditional incandescent lighting illuminates around the perimeter of the dial
  • 12 and 16 volt compatible, well-suited with nearly every street car or race car electrical system
  • Gauge kit includes 1/8” NPT temperature sender, 3/8” and 1/2" NPT adapters, bulb and socket assembly, red and green bulb covers, mounting hardware, and detailed instructions for installation
  • AutoMeter’s race proven air-core electric instruments provide quick and accurate readings while keeping hazardous fluids outside of the vehicle
Ships With
  • 2258
  • 3/8" NPT and 1/2" NPT adapter fittings
  • 2230
California Residents: Prop 65 WARNING prop65 Cancer, Birth Defects and Reproductive Harm



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I don't understand in detail the pdf with instructions that you posted on your website. Please can you post or email me a different installation guide that is easier to understand or more detailed for this water temperature gauge? Thanks.

Asked by: Dronner
We only have the PDF instructions found on the website. If you have specific questions on the installation process you can give our tech support team a call at 866.248.6357 and we would be happy to walk you through it.
Answered by: Alex at AutoMeter
Date published: 2022-06-08

If I tap the sending unit to a hose line, do I need to attach a gound wire off the sending unit as well? Also, does 16 gauge wire work as well as the 18 gauge or do you recommend strickly using 18 gauge wire?

Asked by: Rick S.
If you are remote mounting the sending unit, you would need to ground the sending unit. 16 Gauge wire would work.
Answered by: Thomas From AutoMeter
Date published: 2022-05-17

Is this a mechanical or electric gauge?

Asked by: BobP58
This is an Air-Core, or a Short Sweep Electrical Gauge.
Answered by: Thomas From AutoMeter
Date published: 2022-05-11

what is the total outside dimension on a 2 1/16 gauge and total outside dimension on a 2 5/8 gauge

Asked by: rich041
Rich041, The dimensions of the outside of each of these gauges are as followed: 2-1/16": 2-1/4" 2-5/8": 2-7/8"
Answered by: Steve from AutoMeter
Date published: 2022-04-19

I have this Temp Gauge , I am changing the Intake and looking for a New Temp Sending Unit will the 2385 work with this Gauge , if not which one do I need , Thank You . Bob

Asked by: Bob 55
The correct sending unit for this gauge is 2258. The 2385 will not work correctly with this gauge.
Answered by: Jim from AutoMeter
Date published: 2022-02-10

Are separate 3A fuses recommended for 2 gauges because one shared fuse might burn out too soon? Also, fuse not needed for light circuit because the bulb is acting as the fuse? Thanks for this and previous response.

Asked by: Mike B.
Ultimately, a fuse is not considered a requirement, but a recommendation. If you run a fuse for 2 gauges, you can use one fuse through a single power wire before it breaks off to each gauge. You may run a fuse on the light, but because it's a recommendation and there is little to risk with a bulb going out, it would be purely optional.
Answered by: Matt from AutoMeter
Date published: 2022-01-23

What is the minimum size hole to fit the gauges through? I have 2" holes in my dash, will the gauges fit or do i have to make the hole 1/16" larger

Asked by: Steve1950
Hi Steve, not necessarily. Depending on the tolerance, you may get a tight or snug fit into a 2" hole. You may also only need to sand the hole out slightly.
Answered by: Matt from AutoMeter
Date published: 2022-01-19

About how long are the 12V, light, and ground wires on Ultra-Lite 4327 (oil), 4391 (volts), 4337 (water) and 4475 (tach)? I'm trying to locate a terminal block before receiving gauges. Thanks.

Asked by: Mike B.
On the smaller gauges the included sockets have 7 inches of wire for both the 12V and ground. The 4475 tachometer will include 1/4 inch spade terminals only, but no actual wire. You will need to provide the wire and female spade connections for the tachometer. We recommend 18 or 20 gauge. Complete harnesses like our 2198 will also include the wires and connectors.
Answered by: Matt from AutoMeter
Date published: 2022-01-16
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