can it be wired to an alarm buzzer on a boat?

This does not have an alarm prior to shutdown. image.png

Will this work on an older Mercedes marine diesel engine, 1970s?

works with any engine that has a port for 1/2" pipe thread, Mercedes were metric, you would need to make your port threads to 1/2" NPT. Also, To work this gauge right you need a tattletale relay to shut engine off when temp gets to high.

Which one has the single wire terminal post to activate the shutdown? That is the one I need.

They're all the single wire. The last few digits are the length of the capillary tube. Its a 20t series (gauge mounting size 2"), 250 degrees max and the rest of the numbers are the length (6ft) and pipe thread size (1/2).

You can use on virtually any DC voltage. It just grounds 1 wire when tripped. It must be used in connection with a Murphy switch or you could wire through a relay using the n.c. side for normal operation and this will ground and open the circut.

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FW Murphy Temperature Gauge 2" 20T Series (20T-250-8-1/2 8FT Capillary)

Product ID: 129103517

Details

Brand
FW Murphy
Material
Metal
UPC
600713096699
Manufacturer
FW Murphy

📏Customizable capillary length up to 8FT

🌡️Wide temperature range up to 250°F

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5773418₫

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Description

🌡️ Stay ahead with precision temperature control!

BUILT TO LAST - Durable metal construction designed for industrial and automotive environments
TAILORED TO YOUR SETUP - Choose from multiple capillary lengths up to 8 feet for perfect fit and flexibility
VERSATILE COMPATIBILITY - Fits a variety of pressure ranges and 1/2" NPT connections for seamless integration
TRUSTED BY PROFESSIONALS - Highly rated with 4.7 stars from 113 reviews, a go-to for reliable temperature monitoring
PRECISION IN EVERY DEGREE - 2-inch dial ensures clear, accurate temperature readings at a glance

The FW Murphy 2" Temperature Gauge 20T Series offers precise temperature monitoring with a clear 2-inch dial, customizable capillary lengths up to 8 feet, and robust metal construction. Ideal for automotive and industrial applications, it supports various pressure ranges and features a 1/2" NPT connection. Trusted by professionals with a 4.7-star rating, this gauge delivers reliable performance right out of the box.

Specifications

ASIN	B01DYLXX6Y
Best Sellers Rank	#1,262,905 in Automotive ( See Top 100 in Automotive ) #167 in Industrial Pressure Gauges #907 in Automotive Gauge Sets
Brand	FW Murphy
Brand Name	FW Murphy
Customer Reviews	4.7 out of 5 stars 113 Reviews
Manufacturer	FW Murphy
Material	Metal
Material Type	Metal
UPC	600713096699

Reviews

A**R

Great gauge.

Good quality water temp gauge. Works great. Good price.

19.06.2025

T**B

Fits the application as described

Match to prior like parts and works as should right out of the box.

16.03.2024

B**N

Works Great!

Exactly what I was looking for and shipped quick! Thank you

15.03.2024

R**Z

gracias

muy buen producto

17.12.2019

D**W

GAUGE EXACTLY AS DESCRIBED

This item was exactly as described and was "plug and play" to replace the same gauge on a Kubota generator on which the original supplied gauge capillary tube was too short to reach the new remote gauge panel - We have a couple of hundred hours on the new gauge now and it is working perfectly!

12.07.2017

H**N

Just like my old one

Good quality Murphy switch. Working great after several weeks of use on my irrigation natural gas pump engine.

5.08.2019

B**E

We are a pump rental & manufacturing company

We are a pump rental & manufacturing company Works well for us and cheaper than our normal suppliers.

31.08.2023

A**R

Good quality

Good quality it's being used on a tower crane well sealed should last a long time

25.12.2019

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5773418₫

Duties & taxes included

In stock

Sold byAmazon VietnamDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Vietnam.

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TrustScore 4.5 | 7,300+ reviews

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