Quick question: Does the oil sending unit screw directly into the block, or must I use the sending unit tube as well? I have one currently on my '66 Mustang coupe with 302, but it has an opening for a guage to mount & I don't have the gage causing it to leak because I can't find a correct small bolt to plug it with. So, I'd prefer to just bolt up the sending unit to the block & eliminate the sending unit tube. My auto parts store doesn't carry the sending unit tube... Any information about this? Thanks!