How to determine tank fill levels?

Mines full when waters stop draining in the bathroom. I haven't yet filled the black water tank. I do have sensors but they never work right

I'd look at your tanks and see if they have sensors installed. I bet they do. You could probably get a kit to easily install a monitor. I would think all the tanks come with the sensors installed and the monitors are pretty universal. I didn't even realize anyone made RV's with no tank sensors. Every RV with tanks I've owned has had them including my TC.

Can you see into the black tank by looking down the toilet? Don't understand the lack of tank monitor.

jefffoxsr wrote:
We picked up our new truck camper today. Unlike our 5er and TT this truck camper does not have a light panel to show the fullness of the black, grey, and fresh water tanks.

What is the best way to determine levels so you know whether you can take a shower or flush the toilet?

Thanks.

For my black water tank I just look down inside an open toilet and can see the level. The gray tank isn't as easy. I know about how much gray water I use and when my fresh water gets low, I know if went somewhere, so it is getting close to time for dumping.