It sounds like you may be right. I'm not sure what the voltage should be 'coming out' of the gauge but I would think that it would be pretty close to 10 or 11 volts with 11.8 on the input side.
Again, I'm not sure about it because I haven't measured it. Also, the gauge itself will drop a little something due to internal resistance/impedance but I can't imagine it would drop anywhere near that much.
As for your sending unit, if you have information that some of them are 36 ohms and you are reading 36...that's probably not a coincidence. In fact, I bought one for my '66 once and it looked just like my original but it was somewhere in the neighborhood of 30 or 40 ohms...My old one was 90ohms and I had to return it for the correct one...so, there does seem to be more than one rating in mid sixties time period.
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Greg Reid
Palmetto, Georgia
 
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