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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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

754.72 DT

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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	#219,483 in Industrial & Scientific (See Top 100 in Industrial & Scientific) #395 in Industrial Pressure Gauges #625 in Automotive Gauge Sets
Brand Name	FW Murphy
Customer Reviews	4.3 4.3 out of 5 stars (17) 4.3 out of 5 stars
Manufacturer	FW Murphy
Material Type	Metal
Model	20T
Number Of Items	1
Number Of Packs	1
Part Number	20T
Thread Style	Npt
Unit Count	1 Count
Upc	600713096699

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754.72 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered 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 Tunisia.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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