Slow rising oil pressure

Thank You. Is it worth replacing? I plan to drive the car for at least another year. Is this an expensive repair?

Ed is correct but if you're lucky, you may just have a sludged up oil pressure sending unit that is equally slow to respond, but either way you want decent oil pressure most of the time. So attach a manual guage and see if it reacts the same. Remember that oil has to circulate back to the oil pan and this engine has very small returns in the head/block causing oil starvation in the pan, low pressure. Thus frequent oil changes (clean engine) and synthetic flows better at all temps. So don't run it too hard until oil warms up and gets circulating as shown by good oil pressure.