What parts would i need for tuning up my sentra 04 (specific)

Very odd, but fortunately, that part is available

https://www.nissanpartsdeal.com/oem-nissan-sentra-dipstick_tube.html

And the Dipstick itself

https://www.ebay.com/itm/04-06-Nissan-Sentra-1-8L-Engine-Oil-Dipstick-Level-Indicator-OEM-NEW-11140-8U300-/201036561612

..

https://www.autozone.com/repairinfo/specifications/specificationsMain.jsp?childCatName=Firing+Order+/+Cylinder+Location&childCatId=26200242&categoryNValue=26299999&categoryNameForTitle=Ignition+and+Tune+Up&categoryName=IGNITION+AND+TUNE+UP&childCategoryNameForTitle=Firing+Order+/+Cylinder+Location

Look at the exhaust manifold. the sensor is there. B1S1 is before the catalytic converter. B1S2 is after.

After market parts are usually rebuilt parts vs OEMs are suppose to be new and made for the car specifically.

Contact us at www.nissanpartsnow.com and we can e-mail an image to you. Thanks

right here! for a tune up all you got to do is change your oil, spark plugs, plug wires, air filter. not very hard to do! to change oil, you got to drain all the oil out with a socket or wrench. make sure its not the transmission you drain. but drain oil, then take filter off, take new filter rub oil around the top on the rubber sealing. put on car. put about 5 quarts of oil in. get spark plug socket, change plugs. when you change plug wires, make sure to do it ONE AT A TIME!!! or else you will wire it up wrong and have tons and tons of problems. then air filter is pretty easy, take it out and clean it,,put back in and there you go, tuned up!

change the fluid and clean filter every 15000miles, oil change is every 3000 miles and tuneups are usually every 100000 miles. air filter is done every 30000 miles.
feul filter every 30000 miles as well.

Thanks problem solved

put what ever the oem replacement parts call for