I recently replaced my clutch master cylinder on my 1988 rx7. I wasn't happy with the clutch and felt the old one was way too rusted and was a problem. Now, with the new master cylinder, the fluid is clearly leaking where this line meets the master cylinder. Should i just replace the line?

 

You will want to make sure that the hard line is not cross threaded in the new master cylinder. Also make sure you did not over tighten the line and strip the threads. Ensure that the line is torqued properly and seated in the new master cylinder. If anything was stripped when installing, I recommend replacing both the hard line and the master cylinder.