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I did an underbed gas tank from a 69 mustang. When I hooked up sending unit to the OE 56 f250 gauge, with the float in the empty position, the gauge reads 3/4, full is all the way to the right past full. I tested the sending unit, instead of reading 10-70 ohms, it reads18.5-85 ohms. I even ordered the better one with a brass float. Do I spend another $35 or live with it? Aren't they more accurate than that?
I also bent the stop for the float arm, and it gave me more range but when but when it goes.past the solder bump contact on the inside, it clicks. Could that cause a spark and explosion? Should I try a different one? Had it a year, don't think I can return it.
EmptyFull Vehicle Application
0 ohms 30 ohms Most pre-'65 GM
0 ohms 90 ohms Most GM 65-present
16 ohms 158 ohms Most '87-present Fords
73 ohms 8-12 ohms Most Fords before '87 and most Chrysler
240 ohms 33 ohms Use with 3262 sender
10 ohms 70 ohms Ford Bi-Metallic Gauges (pre-1987 F-Series Trucks)
15 ohms 160 ohms Ford Magnetic Gauges (1987 and later F-series Trucks)
bmoran is exactly right. The gauge has to match the sender. The stock 56 Fuel gauge sender uses heating coils, bi-metalic contacts, on and off current to get a reading to the dash gauge. You would be much better off going to a stock looking aftermarket fuel gauge and sender set up from Mid Fifty if you could. Check it out here:
@hooler1 , I doubt that sender will directly fit the 69 mustang gas tank directly. It seems that the sending unit in that kit is an adoption of the 3262 which matches the 240-33 ohm range specified by their aftermarket gauge and is discussed here: https://www.ford-trucks.com/forums/1...l#post10137118
@hooler1 , I doubt that sender will directly fit the 69 mustang gas tank directly. It seems that the sending unit in that kit is an adoption of the 3262 which matches the 240-33 ohm range specified by their aftermarket gauge and is discussed here: https://www.ford-trucks.com/forums/1...l#post10137118
Yes Gotcha! I am sure you are correct about that. I just wanted to put it out to him, for him to see if it was something that he could think about anyways.
So the ohm range converter won't work with the oem guage and 69 sender? Has anyone cut a hole in the top of the tank and install the 56 oem sender in a mustang tank? You can tell I'm a tight ***!
A resistance/ohm range converter will not work in your situation. The linked thread I referenced earlier shows exactly how a member cut a hole in a 69 mustang tank, but for the aftermarket 3262 sender for use with an aftermarket but OEM looking gauge. I presume doing the same for the stock sender for use with a stock gauge would be similar.
I had it out today changing out my temperature gauge. It's a MidFifty set sender and gauge. I called MiFifty and asked about a fuel gauge that would read a G10 sender and they only have gauges for "their" sending units and stock.
The MeterMatch documentation states it is for resistance/ohm based systems, not king-sealy pulsed.
Originally Posted by dairydude
So the ohm range converter won't work with the oem guage and 69 sender? Has anyone cut a hole in the top of the tank and install the 56 oem sender in a mustang tank? You can tell I'm a tight ***!
Tight? Naw! I am the same only I prefer to think that I am economically creative.😀
The image did not come through. I'm very curious to see how they think the OEM 12V King-Seeley gauge would work with a resistance signal instead of the pulse signal accurately... I mean in theory, they are incompatible protocol signals, but it is technically possible for the "averaging out of the pulses" to be roughly equivalent to a certain resistance and give the appearance of "working" at certain frequencies. I'm going to have to crack out the oscilloscope and investigate... hopefully the image can be posted correctly to steer my experimenting. And, if the MeterMatch did actually engineer the some pulse averaging magic, that should be touted and marketed as a feature.
The image did not come through. I'm very curious to see how the OEM 12V King-Sealy gauge would work with a resistance signal instead of the pulse signal...
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