I would like to add a second oil and temperature senders to my 1960 Cadillac. Looking for recommendation on external ports for both.
Thanks
Pat
Try 2 into 1 brass fittings
Oil pressure you can just use a T fitting. Coolant generally needs to be in the flow so a T doesn't usually work. I don't know a 60 at all to know if there are multiple ports available. If there isn't an alternate port available you have to look for alternatives. There are some that are just metal temp sensors that you put somewhere like under one of the bolts in the thermostat housing that can be reasonably accurate.
Pat,
If nothing else for the coolant temperature sender there are fittings designed to go into the discharge radiator hose into which a sensor can be mounted. https://www.summitracing.com/parts/mio-mmwhs-38-bk
Greg Surfas