as above, which fuel sender unit do I use on the fuel tank of my locost? Which one are you using?

The most common answer to this is to use the one that is specified for your gauge. As the resistances need to match up

Mike

Yup! Use the one designed for the dial. There's no "standard" gauge so you're pretty much guaranteed a mismatch unless you use the designed dial....

On my brothers old car (which admittidly he didn't build), the dial read 3/4 full when it was full and was empty when the dial read 1/2 full.... Not exactly useful and unsuprisingly we ran out of petrol quite a lot.... The official technique was to dip a bit of wood in the tank and see how far up the stick was wet.......

I have a VDO gauge and an Austin maxi sender bought off ebay NOS. They match well enough to know when I am empty , not filled the tank yet so don't know how accurate is over the range. I tried a Range rover one I had as well it worked OK but I didn't use it as it is side entry rather than top. It depends where you plan to get the bits from, if doing a scrappy then collect a few and see if they work, if you know the resistance the gauge is meant to work with you can do it the smart way and add a resistor in series or parallel to get to the right range!

Caber

Yea, I have no gauges yet so I was wondering where to start....