Water temp and oil pressure gauges.

What do you all use for aftermarket gauges? It seems like these "universal" gauges don't seem to have the right fittings for the motor. 1965 225/6 1 bbl auto. I just got a universal water temp gauge and all the fittings look too large for the small /6 temp sending unit. I really don't want to drill and tap. Anybody have a simple answer?

Also I have an oil pressure gauge for a 318. Will that sending unit work on the /6? If not what's a part# for a gauge I can use. Thanks all.