12V Tank Level Gauges & Senders in Perth

Guessing your water level with a torch through a filler cap is fine on a weekend. On a two-week trip to the Kimberley it isn't. A 0–190 ohm sender in the tank and a matched gauge on the dash or wall gives you a real reading every time you look at it — no lifting a hatch, no shaking a tank.

Wema is the marine industry standard for level senders — Danish-made, brass-and-stainless construction, and available in flanged (SAE 5-hole) or threaded (1"-1/4 BSP) mounts. Both come in lengths from 150mm to 800mm to suit any tank depth, on the 0–190 ohm range that matches the Wema fuel and water gauges.

Every sender needs a gauge that reads its resistance range. Wema's fuel and water gauges are calibrated for 0–190 ohm senders, in black or white bezels to match dash and cabinet finishes. Use the fuel gauge for diesel; the water gauge is the same electrics but marked with a water icon.

For battery or water-heater temperature monitoring, the Victron temperature sensor plugs directly into a Quattro, MultiPlus, or GX device. Useful for keeping lithium battery temps in the safe charging window and for monitoring hot-water storage systems.

Fitting a sender means cutting into the tank — usually while it's out of the vehicle. We do sender retrofits, gauge wiring and Victron GX integration at our Bayswater workshop as part of water and diesel tank installs. Not sure which sender length fits your tank? Measure and send us the depth.