I put in a Napa univerasal aux fuel tank sender and guage ... Works fine. I found a SW guage that is more oringnal for my 61 truck... hooked it up and it only reads 1/4 instead of 3/4 Looked in the back it looks like its rubberstamped 6V Any chance I can add a resisitor to make it work correctly "IF so what ohm..??" Bought it for 4 dollars but it matches my motor meter form SW perfectlyy Thanks........
Contact Al from American Autowire - with your Alliance discount it will cost you about $1.75 cents and the shipping will probably be free - at least thats the deal he just gave me on ten of them.
Looks like its only for 6 volt can not go up.... A re builder told me the windings are different than 12V 0-30ohms for 6 and different for 12 would have to be rewound to work cheaper to find used..
Get a resisitor decade box and dial in the value of resisitor needed to run on 12V. Should be able to find a resisitor that will work! Resisitor = resistor
exactly how will adding a resistor make it read fuller? it is already reading to low . are you sure it is 6 volts? the gauge and the sender must match each other
Do you know for sure that your universal Napa sending unit has the same resistance range as the SW 6V gauge? I bought a runtz 6V voltage regulator from a guy on Ebay but I had the proper SW 6V sending unit that matched the 6V gauge. Not all sending units are the same and they need to match the gauge.
Agreed. What he should do is use the decade box to find out the needed sender resistance for full, empty, and in between for the SW gauge. Then see what the OEM sender measures. Go from there. (It is possible to put a resistor in parallel to ground from sender terminal to reduce sender resistance). Just need to know what he is working with first. I liked his spelling, RESISITOR!
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