Could this be tapped into an existing monitor system to act as a secondary monitor panel?

If you use the same sensors it will give you the same reading. If a sensor goes out, both systems will give you a false reading. If you want a secondary monitor get 4 more sensors then you would have a good secondary system.

all tanks are showing whatever the fresh water tank is reading. Might replacing this monitor fix that problem?

All is reading if there is problem for frish cheack sensore

Im confused. Does this come with the sensors to put onto/ into the tank? Or do i have to buy those separate?

It does not come with the sensors. It has the standard hook-ups that snap onto the sensor ends. My tank came with the sensors in it.

what sensors work best with this ?

Kib manufacturers the sensor packs. The probes aren’t super important.

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RecPro RV Tank Sensor Monitor Panel M21 Panel Only (Black)

Product ID: 402219334

Details

Brand
RecPro
Item Weight
0.14 Kilograms
Item dimensions L x W x H
13 x 73 x 118
Material
High-Density
Style
Level sensor

⚡12V DC power compatibility

📊High measurement accuracy

🔧Flange mount for secure installation

Description

🚐 Stay ahead on the road with smart tank monitoring—never run dry or guess again!

EASY INSTALLATION - Flange mount design ensures a secure fit and quick setup—get monitoring fast.
INSTANT TANK INSIGHTS - Clear LED indicators keep you effortlessly informed on fresh, gray, and black tank levels.
SLEEK DURABLE DESIGN - High-density plastic housing in black or white to match your RV’s interior style.
SEAMLESS 12 V INTEGRATION - Plug into your RV’s 12V system for real-time monitoring without extra hassle.
MULTI FUNCTION MONITORING - Track battery voltage alongside tank levels for total system awareness.

The RecPro RV Tank Monitor Panel M21 is a compact, high-accuracy digital sensor panel designed for RVs and mobile homes. It monitors fresh, gray, and black water tank levels plus battery voltage, integrating seamlessly with 12V systems. Its durable high-density plastic build and flange mount ensure reliable, stylish installation.

Specifications

ASIN	B07XZJT5MJ
Brand Name	RecPro
Country of Origin	USA
Customer Reviews	4.4 4.4 out of 5 stars (287)
Item Dimensions	13 x 73 x 118 Millimeters
Item Highlight	12V Battery Level, Built-in Water Pump Control Switch, Simple Push Button Readout, Made in USA
Item Weight	0.14 Kilograms
Manufacturer	RecPro
Material Type	High-Density Plastic
Maximum Supply Voltage	12 Volts (DC)
Measurement Accuracy	High
Measuring Range	6.00 - 12.85 volts_of_direct_current
Model Number	RP-M21
Mounting Type	Flange Mount
Number of Items	1
Number of Packs	1
Output Type	Digital, Electrical signal
Part Number	RP-M21
Specific Uses For Product	RV, mobile home, tank level monitoring, battery level monitoring, water pump control, water heater control
Style Name	Level sensor
UPC	193652017509
Unit Count	1.0 Count
Upper Temperature Rating	60 Degrees Celsius

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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