New fuel sending unit

The middle of the scale is where aftermarket is wrong. All OEM gauges and senders operate on a 80-10 range. A calculator says half way between 80 and 10 is 45 but the OEM gauge doesn't work that way. As the resistor wire in a thermal gauge heats up, its per inch and/or total resistance changes. So a proper non linear sender should signal approx' 34 ohms at 1/4 range, 23 ohms at 1/2 range, approx' 15 ohms at 3/4 range.
8 ohms really is too low in my opinion. It could overheat and damage a gauge, especially one that is aged.
Put you meter leads together to see what resistance there might be. 1 ohm in the meter/leads means a 7 ohm sender if that makes sense.
I'm sorry if this is TMI.
Bottom line, we have 2 choices...
We spend more coin to have a OEM sender properly restored or we buy a meter match module to alter the aftermarket senders signal to the gauge.
A aftermarket gauge might be a 3rd choice depending on what inst' panel you have. Good luck with it.