Hookin up the Gauges

I want to be school'd in the art of auto electric. I am setting up a gauge pod for the bindup. Have an Autometer Speedo and a cluster from a 1940's Poncho. The gas sending unit is still on the tank, Tank being from a newer 12 volt setup. Can I just plug in the sending unit to an old gauge? Or do I have to get a reducer or something to help the gauge read properly?

 

*crickets*

 

You probabally have to have reducer. Because they work off of resistance.

 

You'll need to match both voltage and resistance.
If you've got 6v gauges, you'll need a voltage reducer.
You also need to match the sending unit to the gauge, since different manufacturers use different resistances to read empty and full.

 

If you are running a 12v systems in the car and the sender is a 12v sender the only thing you need to match up is the resistance - doesnt matter if the gauge is 6v or 12v - the gauge only reads the resistance to give you a fuel level.

I have a 12v 47 ford sender running through a 47 ford 6v gauge and it works a treat - the car runs a 12v system though.