So you’ve got your LS engine swap complete and ready to run in your classic, a turn of the ignition away from weeks or months of planning and work. That’s about the time everyone realizes that older original equipment and aftermarket gauges with pipe thread senders and connectors will not plug into the LS platform of engines. Water temp and oil pressure ports on the Gen IV engines are a metric straight thread with an o ring seal. Speedway has you covered, as usual, with these easy adaptors to make your gauges work. 6061 aluminum fitting for no corrosion of dissimilar metals. Brass sealing crush washer for no leak installation. Designed for temp sender gauges. 12mm x 1/8NPT - Short. Sold each.