Does anyone know how to hook up the factory fuel hand in my 97 f350 power stroke to an auxiliary sending unit in a in bed tank so its the only one that works I no longer use the factory tanks and want to use my factory fuel gauge.

 

I don't see why you couldn't, you could adjust the length of the float arm to fit your tank and use the factory wiring. That would be pretty cool!

 

If the auxiliary unit works on ground as I assume it does, then all you have to do is run a wire from that unit and splice it into the wiring harness. I'd do it just forward of the fuel tank selector valve.

0 resistance to ground = "Full"
Infinite resistance to ground = "Empty"

 

Low resistance indicates an EMPTY tank; high resistance indicates a FULL tank.

To the OP, what do you mean by "hand"? So the aux tank has a sending unit, but no float/arm? You'd need to know the resistance range of the aux sending unit.

 

IIRC ~22.5 ohms = empty and ~ 160 ohms = full. Yellow/White wire is the fuel gauge connection you want to tap into is the aux tank sender unit is compatible.

 

Yes madpogue it has both I was referring to the fuel hand on the dash.

 

Also it is an aftermarket sending unit it has two wires only so I guess it does work off of ground. Anyone know the ohms that the factory gauge works on I think I can look the one I have in the aux tank back up and find the ohms on it and see if they are compatible or will it WOR with the factory gauge as long as its wired into the factory harness correctly?

 

OK the one I have in the aux tank says its 32 to 240 ohms if that helps.

 

Probably not. See Hussler's post ^^^^^; I don't remember the exact numbers, but it's something around what he posted (20-ish empty, 150-ish full). So if that 32-240 range is 32 full, 240 empty, it DEFinitely won't work. If it 32 empty, 240 full, then it will give you a ball park, but it wil probably read way past full (over 150 ohms) until it's getting close to half, and then the gauge will start to drop fast.

IIRC, the sending units are just clipped onto the return pipes on the OEM assemblies. I wonder you could remove one from one of them that you're decommissioning, and somehow incorporate it into the pickup assembly on the aux tank, just with a longer arm for the float.