alternative to red fluid fuel gauge?

[Karl]

I use the original fluid that I brought of ebay complete with its corroding bottle. I wear gloves I don't smell it and I don't drink it. I apply it to the top of the gauge using a small 1 ml syringe and a bent hypodermic needle

It works great provided that everything is clean ,there are not 50 calibrating rods in the gauge and everything is sealed up well. Interestingly it to fades over time but much more slowly than what the parts houses sell today