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12-20-2009, 03:29 PM
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1956 Desoto sending unit help?
Howdy hotrodders. I've been thinking about the dash I'm going to make for my Volvo lately and realized I have a big, glaring problem with my current gauge setup. Maybe someone can give me hand.
What I have. Gauges from a 1956 Desoto. Consists of speedo (mechanical so no big deal - hopefully), amp meter (easy), oil pressure (mechanical), but an electrical coolant temp and fuel gauge - ruh roh. Does anyone have any idea what ohm range the fuel sending unit of a '56 DeSoto is? How about the coolant temp sending unit? I've been searching like mad and haven't come across much yet. I did see some guy's site about rebuilding a '56 Dodge Sierra and he mentioned using a standard Stewart Warner 240-33 Ohm fuel sending unit, but aside from that, I'm kind of striking out. Any info would be greatly appreciated and will determine whether I sell these gauges and get new ones or continue on with what I've got. Happy holidays! 
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12-21-2009, 05:11 AM
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Bump it.
Anyone? Or are they going to end up on Ebay?
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12-21-2009, 06:42 AM
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Fuel Sender
Hey Foos, I looked around a bit, it seems the fuel sender is 10 ohms empty and 90 ohms full. Ain't for sure, but it seems anything around that would work, e.g. 0-100 ohm etc. You might consider bench wiring it with a power supply and a potentiometer to test it. Good luck,olnolan.
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12-21-2009, 07:01 AM
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I'd betcha that somewhere on that base is a electrical/electronics repairs shop that can tell you the guage ohms range and sender ohms range and temp guage ohms calibrations in about 2 minutes....
they work as,, just a basic rheostat (same as a old rotary volume control knob or dash lights dimmer) which varies resistance versus constant voltage to move the needle.... in fact the tester is a hand held unit powered by a 9V batt with a rotary knob and a analog display for volts versus ohms while watching the needle move.... because the guages are THAT OLD you do want to test them to know they are still calibrated reasonably correct and reading correct... quite often the guage error diffence is really not a big problem,,,I still have about 4 gallons in the tank when my 65' vintage gas guage touch's the "E" I like "different" and unique in cars so I would do what it takes to use those if they do look great with your dash design... it's not rocket science to get them to work... actually,,, getting a correct fitting end for the speedo cable at the tranny and a correct tranny mph gear may be a challenge.... but if ya got a tach you really don't need a speedo... (just ask a cop to shoot you with his mph read out display radar gun holding steady rpms at 1k/2k/3k) I really did luck out,,,with my 3.55 gears/tires diameter/tranny slippage the radar gun shows each additional 1k is exactly 20mph more,,,3k=60.0mph Last edited by red65mustang; 12-21-2009 at 07:53 AM.
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12-23-2009, 07:37 AM
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Awesome, thanks folks. I'm going to talk to the EMS shop fellas over at 7th group and see what they can do for me, thanks!
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