Stewart Warner 391B-F R Swing 10-15 Fuel Level Sending Unit-240/33 Ohm

							                        

                                                        What brand of gauge will you use?
These Stewart Warner brand fuel senders are compatible with all Stewart Warner and Classic Instruments fuel gauges.
How deep is your tank?
Measure the depth of your tank where the fuel sender arm will be located. Choose the sender with an operating range which includes that dimension. 
Right or Left-swing arm?
Most fuel gauge senders attach with a 5-screw pattern. Two of these screws are farther apart than the other three. Position yourself such that the 2 wider-spaced holes are closest to your chest; a right side sender will have the arm (or "float") extending to your right, and a left side sender will have the arm extending to your left. This only matters when replacing an existing sender. A first-time installation can use either one, just drill the mounting holes accordingly.
LH/RH Swing Guide (Link)  
  
OHM
The OEMs used several different resistance ranges for fuel level indication over the years. However, some of the aftermarket gauge manufacturers follow the common Stewart Warner values (240 ohm empty, 33 ohm full). The gauges and senders that we carry (385 & 391) use these standard Stewart Warner values.
Ohms Chart (Link) 
                                                    

						                        

							                        

                                                        Choosing a Fuel Level Sender;
What brand of gauge will you use?
Speedway carries the excellent Stewart Warner brand of fuel senders. They are compatible with all Stewart Warner and Classic Instruments fuel gauges.   
How deep is your tank?
Measure the depth of your tank where the fuel sender arm will be located. Choose the sender with an operating range which includes that dimension.
Right or left-swing arm?
Most fuel gauge senders attach with a 5-screw pattern. 2 of these screws are farther apart than the other 3. Position yourself such that the 2 wider-spaced holes are closest to your chest; a right side sender will have the arm (or "float") extending to your right, and a left side sender will have the arm extending to your left. This only matters when replacing an existing sender. A first-time installation can use either one, just drill the mounting holes accordingly.
LH/RH Swing Guide (Link)  
OHM
The OEM’s used several different resistance ranges for fuel level indication over the years. However, some of the aftermarket gauge manufacturers follow the common Stewart Warner values (240 ohm empty – 33 ohm full). The gauges and senders that we carry (385 & 391’s) use these standard Stewart Warner values. 
Ohms Chart  (GIF)
                                                    

						                        

							                        

                                                        
This sender is for fuel gauges from Classic Instruments, Stewart Warner, Autometer, and Sun. 240 Ohms empty, 33 Ohms full. It will work in tanks from 6" to 24" deep and it has a right-hand swing. 
LH/RH Swing Guide (Link)
Ohms Chart (Link) 
                                                    

						                        

							                        

                                                        
Sending unit for Omega Kustom fuel level gauges. Will work in tanks from 6" to 24" deep. It can be used as a right hand or left hand swing unit with minor adjustment.
Made in the USA.
Learn more about selecting the proper fuel sending unit by reading our tech article, Fuel Sending Units.  
                                                    

						                        

							                        

                                                        What brand of gauge will you use?
This Stewart Warner brand fuel sender is compatible with all Stewart Warner and Classic Instruments fuel gauges.
How deep is your tank?
Measure the depth of your tank where the fuel sender arm will be located. Choose the sender with an operating range which includes that dimension. 
Right or Left-swing arm?
Most fuel gauge senders attach with a 5-screw pattern. Two of these screws are farther apart than the other three. Position yourself such that the 2 wider-spaced holes are closest to your chest; a right side sender will have the arm (or "float") extending to your right, and a left side sender will have the arm extending to your left. This only matters when replacing an existing sender. A first-time installation can use either one, just drill the mounting holes accordingly.
LH/RH Swing Guide (Link) 
  
OHM
The OEMs used several different resistance ranges for fuel level indication over the years. However, some of the aftermarket gauge manufacturers follow the common Stewart Warner values (240 ohm empty, 33 ohm full). The gauges and senders that we carry (385 & 391’s) use these standard Stewart Warner values.
Ohms Chart (Link) 
                                                    

						                        

							                        

                                                        Fuel level gauges are designed to work with  specific sending units that vary from one automobile or gauge  manufacturer to another. Some increase resistance from Empty to Full,  while others decrease as the level goes up. For a builder updating their  vehicle with new gauges, this presents a problem in that the  aftermarket gauges must match the sending unit located in the tank. This  module will allow you to use your stock sender with any fuel gauge. You  no longer have to remove the tank to add a separate sending unit or  modify the sending unit that comes with a aftermarket gauge set.
Simply wires in-line between your gauge and existing sender
Allows you to use your stock sender with any fuel gauge
No need to remove the tank to add a separate sending unit 
Fuel Gauge Interface Module Instructions (PDF)
 
Learn more about selecting the proper fuel sending unit by reading our tech article, Fuel Sending Units.