http://www.dvsegmbh.info/PDF/einbau/42007/83/15-60_TAUCHROHRGEBER%20MB.PDF

224-817-014-025R ,I think....
float stop upper limit (full)
3.2 ± 0.5 Ohms
float stop lower limit (empty)
69.4 ± 2.0 Ohms
Clearance: Sender lower edge to tank
bottom > 4 mm
Good luck!