New fuel tank and sending unit

You will find that the BIG problem with the sending unit is lack of accuracy. Some guys have bought either the original or a copy of "meter match" It's an electronic circuit that can be used to adjust (scale) the fuel gauge reading so that it's more accurate
That’s good to know! I’ve just been removing and replacing stuff after 50 years of sitting around (my first car). I’ve just gotten it running and enough fuel in it to keep it running. I haven’t driven it yet, or added enough fuel to see if it even registers on the gauge. I’ll definitely take your advice, if that becomes an issue! Thanks for the advice!