[tubman]

First, make sure you know exactly what you have. Just about all replacement tanks we know about come with resistance type sending units that are incompatible with the original Ford gauges, that work by the King-Seeley principle. Some folks say they have been able to get them working together for some effect, but I've never seen it. Why the incompatibility you ask? It's probably because the replacement tanks are intended for the Street Rod market that uses the aftermarket gauges.