I replaced the water pump on my 1999 dodge dakota v6 magnum 4x4 3.9L and on the top right of the water pump theres a thin metal tube that goes in that how is that installed because it looks like it just slides right in but it leaks out of it what did i do wrong with that?

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You did not mention which engine you have, so I will assume its the V6. What condition is the ignition system in ? Cap and rotor ?

there should be a tag located under the hood that says how many ounces the system holds

It could be either threaded or press fit depending on who made the pump for Dodge. Drain the system and attempt to remove the pipe by turning it CCW. If it is a press fit, it shouldn't turn at all and you may need to replace the entire pump for repair. If it turns, pull it out and line the threads with several turns of teflon tape wound in a CW directon (looking at the thread end). Make sure the casting is not cracked at the hole where the pipe fits.

V6 engine? If so, there is a small plastic vacuum tube that runs from the blend door actuator under the dash to a connector in the engine compartment. The tube goes thru the fire wall about 5 inches above the throttle cable (right under the heater core tubes). The tube runs about 10 inches (behind the intake manifold) to a vacuum tube that tee's off the right side of the intake.

My tube was broken....dealer and NAPA did not have a tube that small but had one that fit over it for a quick splice.

should start on the pass side of the intake and go to a fitting on the firewall which goes under the cowling and through the cab.

by the thermostat hausing

That sounds like the heater bypass tube. On the end of the tube going into the water pump is an o-ring. Pull out the tube, clean it real good, put a new o-ring on it. Clean the hole well that it goes in. Then I will put a slight amount of silicone around the o-ring. That helps it go back together and fills any imperfections.
Hope this helps you.

It could just be your oil filter.
But most likely a weak pump, or a clogged pickup screen in the oil pan

Check out your freeze plugs. They are thin metal cups that press fit into the side of the block. Use a mirror and a light to inspect while the engine is running.