We have an MX5 with no low fuel light. We were driving from Plymouth to Bere Regis on the last quarter of a tank, about 100 miles and were thinking “this is getting VERY low” on the fuel gauge, but there were no petrol stations on that route open at 1am.
Got home thinking the fuel light was broken and had a google to find it doesn’t have one- as quite a few people online had found out! Straight to the petrol station half a mile up the road in the morning and lesson learnt.
As for digital gauges, my Skoda has one and it’s fine. It tells me how much fuel there is, it also tells me how many miles are left which over reads until you get to the last 150 miles when it gets really pretty accurate. Had it as low as 5 miles once and spent 2 miles shitting myself but that was my fault, not the car’s.