I would. There are some sender units made (aftermarket) with a second fitting. You can measure the backpressure if you can rig a tee fitting and gauge You (I'm sure) know how I'm "redneck" On my 67 I took an awl and punched (not drilled) a hole into the drained tank, then filled the tank with CO2 from my welder bottle. Then just silver brazed a scrap of copper in there. Use your own judgement.