I've been using the wema senders lately, I can't say they are any better(time will tell) but they sure are easier to install. Measure the tank, order the sender that's the right length and install. No bending or moving the float around. As far as testing them, I ground the pink wire to the ground wire on the sender, if the gauge buries itself, then its most likely the sender. If the gauge doesn't move, check the wires, power and ground to the gauge, then ground the pink wire at the gauge, if the gauge doesn't move, the gauge is bad. If you want to get real fancy, Lavorsi sells a sender that once its installed, you empty the tank(leave a couple gallons just in case), turn the screw on the pot till the gauge reads empty, then fill the tank and set the other pot till the gauge reads full. Regardless of what kind of gauge or sender you have, its only going to so accurate due to the design of most boat tanks
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