Markus10598 Posted February 3, 2010 Report Share Posted February 3, 2010 Does anyone know the ohms of a stock P15 sending unit? I have a 1946 P15 Special Deluxe and I am trying to get a new gas tank and sending unit from "Tanks, Inc." but I don't know what the ohms of the original sending unit is. I tried to look it up in the copy of the Plymouth service manual I have, but it only lists the part number, not the ohms. If you know what the ohms of the stock '46 P15 sending unit is, please post! Quote Link to comment Share on other sites More sharing options...
TodFitch Posted February 3, 2010 Report Share Posted February 3, 2010 The sending unit used from 1946-48 is a two wire unit and I've never seen a listing for the resistance. The value from one terminal to ground goes down while the value from the other terminal to ground goes up as the arm moves. I don't believe that any modern single wire sending unit will work in that application. Quote Link to comment Share on other sites More sharing options...
Markus10598 Posted February 3, 2010 Author Report Share Posted February 3, 2010 Not happy with that!! Does anyone know how exactly the sending unit works in conjunction with the fuel gauge? Would there be a possibility of doing some "conversion" to convert the single-pole measuring of the new sending units into a way of providing the proper voltage to the old fuel gauge? I'm game for putting together a circuit board and putting it in between the sending unit wire and the old fuel gauge if I can make it work again! But I would need to know the electronics of the original system in order to rig something. Right now, the original fuel gauge doesn't function. However, I haven't gone through and troubleshot the reason behind it - could be a bad sending unit, bad wires or a dead fuel gauge. If the gauge is still working, how would I test the gauge without a functioning original two-wire sending unit? Quote Link to comment Share on other sites More sharing options...
Young Ed Posted February 3, 2010 Report Share Posted February 3, 2010 Buy a dodge or plymouth 1 wire sender gauge and swap faces. Paint the needle to match and you should be good to go. 51-54 plymouth would be a good source Quote Link to comment Share on other sites More sharing options...
Markus10598 Posted February 3, 2010 Author Report Share Posted February 3, 2010 Buy a dodge or plymouth 1 wire sender gauge and swap faces. Paint the needle to match and you should be good to go. 51-54 plymouth would be a good source I guess you mean a Dodge or Plymouth 1 wire FUEL gauge, right? Will it fit in the stock fuel gauge space of the '46 Plymouth? I really don't want to go cutting/drilling to force a different gauge to work in the stock dashboard in case I can get my hands on original parts to replace these "newer" parts I'm putting in it. Quote Link to comment Share on other sites More sharing options...
Young Ed Posted February 3, 2010 Report Share Posted February 3, 2010 I cant say I've ever done it but all the gauges are pretty similar. I have a 46-48 chrysler temp gauge in my p15 that I fit by swapping the guts over to the p15 mounting plate and face. I also had what I think was a 51-52 dodge car gauge in the housing for my 46 pickup. I'd have to see if I have a 51-52 ply fuel gauge around to compare with. Quote Link to comment Share on other sites More sharing options...
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