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: 187076133

Details

Brand
RecPro
Item Weight
0.14 kg
Item dimensions L x W x H
0.5 x 2.88 x
Material
High-Density
Style
Modern

💧Fresh, gray & black tank levels

🔋12V battery monitoring

🔘Simple push-button readout

EC$184

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Sold byAmazon Saint Vincent and the GrenadinesDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚐 Monitor smarter, travel farther — never run dry or powerless again!

MADE IN THE USA - Quality and reliability you can trust, engineered for the modern road warrior.
EFFORTLESS CONTROL - Built-in water pump switch lets you manage water flow with a simple push button.
SLEEK DURABLE DESIGN - Modern black panel crafted from high-density plastic blends seamlessly with your RV interior.
STAY POWERED INFORMED - Real-time 12V battery voltage monitoring keeps your RV energized and ready.
TANK LEVELS AT A GLANCE - Intuitive LED indicators for fresh, gray, and black water tanks eliminate guesswork.

The RecPro RV Tank Sensor Monitor Panel M21 (Black) is a compact, surface-mount digital monitor designed to track your RV’s fresh, gray, and black tank levels alongside 12V battery voltage. Featuring a simple push-button LED display and built-in water pump control, this durable, high-density plastic panel offers precise, real-time monitoring to keep your RV systems optimized. Made in the USA, it’s the essential upgrade for savvy RVers who demand reliability and style on the road.

Specifications

ASIN	B07XZJT5MJ
Best Sellers Rank	#85,837 in Automotive ( See Top 100 in Automotive ) #70 in RV Water Pumps & Accessories
Brand Name	RecPro
Customer Reviews	4.4 4.4 out of 5 stars (296)
Item Dimensions	0.5 x 2.88 x 4.63 inches
Item Highlight	12V Battery Level, Built-in Water Pump Control Switch, Simple Push Button Readout, Made in USA
Item Weight	0.14 kg
Manufacturer	RecPro
Material Type	High-Density Plastic
Maximum Supply Voltage	12 volts_of_direct_current
Measurement Accuracy	High
Measuring Range	6.00 - 12.85 volts_of_direct_current
Model	RP-M21
Mounting Type	Surface Mount
Number of Items	1
Number of Packs	1
Output Type	Digital
Part Number	RP-M21
Style Name	Modern
UPC	193652017509
Unit Count	1 Count
Upper Temperature Rating	60 °C

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TrustScore 4.5 | 7,300+ reviews

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Great price for an authentic product. Fast international shipping too!

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EC$184

Duties & taxes included

In stock

Sold byAmazon Saint Vincent and the GrenadinesDelivered 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 Saint Vincent and the Grenadines.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Suresh K.

Very impressed with the quality and fast delivery. Will shop here again.

4 days ago

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Excellent communication throughout the order process. Product is perfect.

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