Can this be used on an old diesel tractor with no ignition system? What do you connect this to?

It is simply a clock. Connect it in parallel to any 12V device that is on when the tractor is running. If no such devices exist,then connect it to a 12V - 24V battery thru a switch. Turn it on when you start the tractor and off when stop.

No it is not back lit. Need to mount where it is easy to see.

What is the real size required for mounting? previous answers vary from 1.3 t0 1.5 to 1.8. which is it?? anyone have a ruler?

It measures 7/8" height x 1 13/32" width

I see you claim these are not water proof, but can it be used on a riding mower when it occassionally be in the rain?

I had one of these hour meters on my flats boat (salt water) for nearly 10 years with no issues. I replaced it with one from Amazon because I had the powerhead on the motor replaced, so the hour meter had to be zeroed out. I expect this replacement model to last.

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ATOPLEE 12v to 36v Truck Tractor Diesel Outboard Engine Hour Meter Rectangular

Product ID: 405425268

Details

Brand
ATOPLEE
Item dimensions L x W x H
5.4 x 5.4 x
Item weight
0.02 Pounds
Material
Acrylonitrile
Number of Items
1

🔋Wide 12-36V DC operating voltage

⏱️Quartz oscillator for precise timing

⚙️Tracks up to 99,999.9 hours

Description

⏳ Track Time Like a Pro — Never Miss a Service Beat!

ROBUST LIGHTWEIGHT DESIGN - Compact 5x3.3x2cm size and just 55g—built to endure vibrations up to 8g without missing a beat.
EXTENDED HOUR TRACKING CAPACITY - Monitors up to 99,999.9 hours, so you never lose track of critical maintenance intervals.
UNIVERSAL VOLTAGE COMPATIBILITY - Seamlessly operates across 12 to 36 volts DC, perfect for trucks, tractors, boats, and more.
SPLASH RESISTANT FOR REAL WORLD USE - Engineered to handle splash exposure, ideal for rugged outdoor environments (just don’t submerge!).
PRECISION TIMING EVERY SECOND COUNTS - Quartz oscillator ensures ultra-accurate hour tracking for your heavy-duty machinery.

The ATOPLEE 12v to 36v Hour Meter is a precision quartz-based timing device designed for professional-grade tracking of engine and machinery run-time. Compact and lightweight, it supports a broad voltage range and withstands heavy vibrations, making it ideal for trucks, tractors, boats, and other equipment. With a splash-resistant build and an extensive 99,999.9-hour display, it empowers managers to optimize maintenance schedules and maximize operational efficiency.

Specifications

ASIN	B00M3V2Z2A
Best Sellers Rank	#175,244 in Automotive ( See Top 100 in Automotive ) #36 in Car Electrical Hour Meter
Brand Name	ATOPLEE
Customer Reviews	4.1 4.1 out of 5 stars (252)
Item Dimensions	5.4 x 5.4 x 2.3 centimeters
Item Weight	0.02 Pounds
Manufacturer	ATOPLEE
Material Type	Acrylonitrile Butadiene Styrene (ABS)
Model	CECOMINOD005248
Number of Items	1
Number of Packs	1
Part Number	SYS
UPC	601308131351
Unit Count	1 Count

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