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: 526317544

Details

Brand
FW Murphy
Material
Metal
UPC
600713096699
Manufacturer
FW Murphy

📏8FT Capillary

🔧20T Series

🌡️2" Display

¥3328

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Description

🔥 Elevate Your Monitoring Game!

DURABLE DESIGN - Built to withstand tough environments.
EASY INSTALLATION - Quick setup for immediate use.
PRECISION MONITORING - Stay ahead with accurate temperature readings.
VERSATILE APPLICATIONS - Perfect for various industrial settings.
USER FRIENDLY INTERFACE - Clear display for effortless reading.

The FW Murphy Temperature Gauge 2" 20T Series is a robust and reliable instrument designed for precise temperature monitoring in industrial applications. Featuring an 8FT capillary for flexible installation, this gauge ensures accurate readings in even the most challenging environments.

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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¥3328

Duties & taxes included

In stock

Sold byAmazon ChinaDelivered 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 China.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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