the senders 12 volt gm style come with the 5 to 6 adaptor
then you can run an aftermarket gm fuel gauge
the benefit here is the OHMs rating will be the same
i.e. you will get a correct reading
note IF you buy a poly plastic tank, the central losenge prevents the long length of the rod and float,
buy the stainless steel version.
if its a pickupo 37 you need the one with the filler into the corner.