Most therm housings will have the port for a gauge. It will have a pipe plug in it if it wasn,t used. They all have bypass hoses that go from the water pump to the therm. housing. The 73 up used a 5/8 hose & the earlier ones used a 1 in. They are available from any parts store. The water outlet direction depends on the application. They interchange with v-8,s.
