KAOLALIFuel Gas Sender Stainless Steel Fuel Sending Unit 1000MM Marine Boat Water Level Gauge Sensor 5 Hole fit Fuel Water Gauge 0~190ohm

I've seen reviews stating that this sender only shows 4 positions on a gauge, I've installed mine in a boat water tank using a KUS gauge and it drops as the water drops, even in-between F - 3/4 - 1/2 etc......Easily wired and simple to install.

I bought these to use with a Simarine Pico monitoring system for my camper van. They work great and give a really accurate reading of my water tank levels.

If you want something to operate an analogue gauge, look elsewhere. If you're operating a 4 bar graphic display or something with a huge amount of damping you'll possibly be fine - it will only tell you empty, 1/4, 1/2, 3/4 and full. 5 switch points of 0, 51, 90, 130 and 190 Ohms. Nothing inbetween.Will suffice for my application but might not for others..

This seems well made it was quite easy to install. I installed this in a polythene water tank making the hole with a hole saw. The float is 35mm dia for my model which was the 350mm. I cut a very slightly smaller hole and filed it out. The sender doesn't sit centrally but I found a locator on Thingiverse which helps to locate the sender in the centre of the hole for fitting. This item makes fitting the sender a doddle. I used M5 stainless self tappers. The M5 machine screws that come with the unit dint work for me. It would be useful if the unit also came with an internal washer and ring with captive nuts for the m5 machine screws. I haven't yet tested the watertightness.