How to Pick an RV Propane Tank Gauge: Five Options for Campers

Few things end a cold-morning camp breakfast faster than the furnace clicking off because the propane ran out overnight. Most RVs ship with a basic dash gauge that jumps from full to empty with little warning, which is why owners add their own tank gauge. The best RV propane tank gauge for you depends on whether you want a cheap mechanical dial you read at the tank or a sensor that sends a level reading to your phone.

Five options are covered here, from simple screw-on gauges to wireless sensors that report over Bluetooth. Descriptions stay with what each product name says, plus general trade-offs, so read the listing for tank compatibility, battery type, and mounting steps before buying. As of 2026, wireless sensors have become a common upgrade for travel trailers and fifth wheels with two tanks.

Quick Picks

How to Choose

Wireless sensor or mechanical gauge

Mechanical gauges are inexpensive and need no batteries, but you have to walk outside to read them, and many show only a rough range. Wireless sensors report a level to your phone, so you can check the tank from bed. A good rule of thumb is to buy a sensor if you camp in cold weather, where checking outside is unpleasant and running out is costly.

Cost of failure is the reason this accessory exists. A furnace shutting off at night, a stove going dark mid-meal, or a fridge warming in summer are all avoidable with a reading you trust, so even a modest gauge beats guessing by the weight of the cylinder.

Tank size and type

RV tanks come as 20-pound cylinders and as larger ASME tanks mounted on the frame. Check that the gauge or sensor works with your tank’s size and material, usually steel or aluminum. Some sensors attach magnetically to steel tanks but need a mounting plate on aluminum.

Bare-tank weight is a handy cross-check. A typical 20-pound cylinder lists a tare weight stamped on the collar, and a full tank holds about 20 pounds of propane above that. Weighing once on a bathroom scale and comparing it with the sensor reading tells you how far to trust the display.

Measurement method and accuracy

Ultrasonic sensors measure through the tank wall and report level in percent. Weight-based and float-based approaches work differently, and temperature can affect readings. Compare your reading against a known weight once, and treat the number as an estimate, not a precise fuel measure.

Sensors also read differently when the tank is hot from sun or cold overnight, and when liquid sloshes after a drive. Let the rig sit level for a few minutes before trusting a number, and compare readings at the same time each day for a cleaner trend.

Power, range, and mounting

Wireless sensors run on batteries, often coin cells or AAA, so check expected life and replacement type. Bluetooth range is typically around 30 feet in open air but shorter through metal walls, so test it from where you sit. Make sure the sensor is rated for outdoor temperatures and water exposure.

One last practical point: keep a spare cylinder and know the nearest refill point on your route. A gauge only warns you; it cannot create fuel, so a backup tank and a refill plan remain the real safety net for cold-weather trips.

Our Picks Reviewed

Mopeka Pro Check

Imagine a freezing campsite morning: instead of pulling on boots to inspect the tank, you open an app in your sleeping bag, see the level, and decide whether to swap tanks before the furnace cycles again.Mopeka is a brand focused on propane level sensors, and the name Pro Check suggests a sensor meant to check tank level from a phone.

• Pro: a wireless sensor lets you monitor the level from inside the rig, which is useful on freezing nights.
• Pro: sensor-based monitoring gives a percentage reading you can trend over several days, helping plan refills.
• Con: wireless sensors rely on batteries and a phone app, so a dead battery or a Bluetooth glitch can interrupt readings.

Skip it if you do not carry a smartphone on trips or you prefer a gadget with no app. Owners of non-standard tank materials should also confirm compatibility, since mounting depends on tank construction and some tanks need an extra plate.

Mopeka Pro Plus

Travelers with two tanks often like a matched pair of sensors, since both levels appear in one app and the order in which tanks are drained becomes obvious instead of a guess made at the regulator.The Plus label implies a step-up from the standard Pro sensor, aimed at owners who want more capability.

• Pro: a step-up sensor in a known line offers the same easy phone-based monitoring with extra features, depending on the version.
• Pro: it fits the same app ecosystem as other Mopeka sensors, so adding a second sensor for a second tank is simple.
• Con: a Plus model typically costs more than a basic one, which adds up with two tanks.

Skip it if you want the cheapest possible solution or only fill the tank a few times a year. Read the listing to see what the Plus designation adds, because the difference from the base model may not matter for your trips.

Mopeka TD40

Manufacturers that sell several sensor styles do so because tanks differ, so a short compatibility check with your tank’s size and construction avoids a return and gets the sensor reading correctly on day one.TD40 is a separate model in the Mopeka family, which suggests a different design from the Pro series.

• Pro: Mopeka’s focus on tank-level monitoring means a mature app and a wide user base for tips.
• Pro: a different model line gives you an alternative if the Pro sensors do not suit your tank type.
• Con: with several models in one brand, it is easy to order the wrong one, so confirm compatibility with your tank.

Skip it if you want a plain mechanical gauge or you are unsure which sensor type fits your tank. Check the manufacturer’s compatibility chart before buying, especially for non-standard cylinders or fixed tanks on the frame.

Camco Propane Tank Gauge

Weekenders who fill a tank once or twice a season often decide a dial is enough, using the reading as a rough warning to swap cylinders before a long weekend instead of tracking every percentage point.Camco is a well-known RV accessory brand, and a tank gauge from this maker suggests a simple, glance-and-go tool.

• Pro: simple gauges are inexpensive and easy to understand, with no app or battery.
• Pro: an RV-focused brand is likely to match standard POL fittings and common tank types.
• Con: mechanical gauges give a rough read and require you to go outside to check.

Skip it if you want to monitor the tank from inside the rig, or if you need precise readings to plan refills. In cold climates, standing outside to read a dial in the dark is the main reason people upgrade to a wireless sensor.

Flame King Propane Tank Gauge

Buyers who already use Flame King cylinders or fittings sometimes pick matching accessories for simplicity, which keeps the tank setup consistent and the shopping list short before a first trip of the season.Flame King is a propane-focused brand, and this product is a basic gauge intended for tank level checks.

• Pro: a basic gauge is a low-effort upgrade that you can attach in a couple of minutes.
• Pro: no batteries or app means there is little that can fail or need replacing.
• Con: a basic gauge is limited in precision and visibility, particularly at night.

Skip it if you want remote monitoring or a clear digital readout. Heavy users who run furnaces and water heaters through winter will quickly outgrow a simple gauge, and anyone with two tanks may prefer sensors for each one.

Which One Fits

• Cold-weather camper who wants indoor monitoring: Mopeka Pro Check.
• Two-tank trailer owner who wants step-up features: Mopeka Pro Plus.
• Owner whose tank does not suit the Pro series: Mopeka TD40, after a compatibility check.
• Casual weekend camper: Camco Propane Tank Gauge.
• Occasional user wanting something cheap and simple: Flame King Propane Tank Gauge.

A simple routine works for most campers: check the level on arrival, again the morning before departure, and whenever the forecast turns cold. Note the percentage in a trip log, and after a couple of outings you will know how many nights a tank lasts with your appliances.

Keep the gauge or sensor clean and dry, since dirt or ice can hide small leaks and false readings.

Common Mistakes

1. Trusting a gauge as exact and running the tank to empty.
2. Buying a sensor without checking tank material and size.
3. Forgetting to carry spare batteries for a wireless sensor.
4. Reading a cold tank immediately after heavy use, when temperature skews the number.
5. Mounting a sensor where road spray or heat will damage it.

FAQ

How long does a 20-pound tank last?

It depends on appliances. A furnace in cold weather can empty one in a few days.

Do sensors work in cold weather?

Many do, but check the listed temperature range and expect shorter battery life when it is freezing.

Can I use a sensor with a frame-mounted tank?

Often yes, but confirm compatibility with the tank’s material and wall thickness.

What about evening entertainment at camp?

Check our notes on the RV antenna for digital TV for free local channels.

Do I need other gear for the drive?

Yes. A portable tire inflator belongs in the tow vehicle along with the gauge spares.