i know this has been done 1000s of times, but what are the details? I even remember doing this years ago in a 49 Merc, and I know eveything but the gas gauge worked. I have a power supply that will put out 6 volts + ground but are the gauges isolated? Can I apply the 6 volt + ground to the senders without having a short? Should I use 6 volt - ground and reverse the wires on the back of the gauges? I couldn't find a power reducer at any Ford dealer like they used back in the 60s and 70s so I got one at Nappa and it puts ot 12 volts - like 12 in and 12 out. bad piece? or what, no clue. so I found this real trick unit that has heat sinks and definitely will supply 6 volts + or - ground - I'm just not sure what to do here. HELP!
Not sure what your question is, but gauges are not usually polarity sensitive. They can be run on either a positive ground or a negative ground system. No, they are not "isolated", they are part of the normal electrical system.
well i just did a 49ford a few months ago for a guy. i had the temp gage redone for 12v. gas worked ok gas, oil, all worked on a volt drop. the volt drops that are a resister have to have a LOAD to drop the volts down to 6v. no load or a very small load and it will stay at 12v. i have 2 pairs of temp senders now for a 49 ford lol stock set and a aftermarket. i need to put them up for sale.
I just did a '51 Ford. The fuel, oil, and temp are all powered by a single power strip on the back of the gauges I used a single small round voltage reducer like they have for sale on EGay, but you can get them from Painless or Hot Rod Wires. I think it is 1-1/2 ohms. The gauges all register correctly with 12 volts. You have to switch the two wires on the amp gage for correct polarity.
I am putting a fuel gauge in a '55 F100, and need to know how to 'wire' it. The truck is 12volt, and I have three dash wires (?) and the stock tank unit! What ext?
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