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My name is ***** ***** I am a professional here at Just Answer. I noticed that your question had not received a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.
Usually the sending unit needs a ground to operate.Make sure you have a ground connected where it should be and see if this corrects this fault here.If this is or has been attempted with no success let me know.
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Was the sender that was installed one that is made or compatible for this model here?
Unfortunately this is all of the info I have on this here myself.
I will open your question up for others here to see if someone else can assist further on this as there may be others here that may have more info on what to check or do with this issue.I hope you can get this resolved with ease.No need to reply to my last post here unless it is a last resort as it will keep your question locked to me and others will not be able to view it.If you feel you want to continue to work with me on this feel free to reply at any time but keep in mind in some cases it can be difficult to fully diagnose or help repair this without seeing your vehicle.
Good Afternoon Pete, I am Joe one of the experts here at Just Answer. I have a few questions that will help me route you to the right answer. The fuel sending unit that you installed is a direct replacement for a 49 Merc, correct? Your gauges are aftermarket gauges from Vintage Gauges or are they 49 Merc Replicas?
the sending units are variable resistors with a specific ohms range and the fuel gauge needs to match that range.