I'm looking to get the original gauge cluster working again on my 49 Lincoln. Fuel, temp, alt and oil are all on one gauge. Power comes in and each gauge is controlled by ground from each respective gauge. It's been converted to 12 volt years ago by my grandpa and he just cut all the existing wires, left them still attached to the gauges but cut them out from the car so to say. He put in mechanical oil and temp gauges and a 12 volt alt gauge but didn't do anything abou the fuel gauge.

I understand that I'll need to install resistors inline if i use the original fuel sender and gauge but how do I utilize the mechanical gauge stuff on the original gauge? It has a SBC 400 in it and the harness has all been converted. Would it be be easier to just get a set of new gauges? Because I can't obviously install the copper oil line and the metal temp line into the old school 6 volt gauge. If I get new gauges will I need an aftermarket 12 volt fuel sender? I assume I would...