Apologize if this should've gone in a different area. I'm looking to see what the fitting size is on the back of the oil pressure gauge on my 54'. Mine was missing. I put a 350 in but I'm still utilizing my original gauges. I purchased a new 1/8" copper tubing kit from Bosch. I have the 1/8" NPT male in the kit for the block but I'm struggling with the proper fitting for the gauge for the copper tube to fit in to. In the kit they supplied 1/8" NPT female fitting. It appears the gauge fitting might be a 5/16-24 male. In looking at different kits some appear to just have standard fittings where some have what looks to be a specialized fitting for the 1/8" tube for the gauge. Not sure if that piece is needed or not based on the "kits" between vendors specified for the truck. Any information on this fitting or if I should just buy an entire proper kit are welcomed. Thanks

Adam

Adam