Markus, you were correct. Thank you! The issue was, despite trying to wire in series before, I know it should not be in parallel, I had very low fuel level, so the readings were not correct. Thought maybe the problem lies elsewere. Filled 30l, connected fuel level senders in series, and works brilliantly! I had to save the original wiring, because it was totally fine, so I made extension using factory connector. Attaching pictures, if somebody stumbles to this topic from web search engines. http://lejup.lv/thumbs/5ec00f12e9f74ctgkjar1589645076.JPG http://lejup.lv/thumbs/5ec00f12e9f74xmyldgf1589645074.JPG http://lejup.lv/thumbs/5ec00f12e9f74hevulkz1589645077.JPG