Jareduhhh

My 98 xj is kicking these codes! please chime in if you have any advice on my diagnosing!
So busy with school/work, any help is appreciated as I'll only be able to physically work on it during the weekends.

P0107 Map baro circuit low input
Dirty sensor is my first guess.

P0320 ign/dist speed input signal malfunction
Cam sensor going out? I know my timing chain is overdue. I'm at 120000 now. Maybe my chain having a little more slop than normal is causing this code?

P0463 fuel level circuit high input
Probably no big deal, I notice that the fuel gauge is pegged past full after I fill it, but it still functions normally.


These last two have been in the system since I've owned this Xj. I've personally serviced the transmission and added an inline air to oil cooler, and eliminated the radiator heat exchanger. I've noticed no abnormal transmission operation whatsoever. Every gear and transmission selection functions as it should.
P0700 trans control malfunction
P0740 tcc circuit malfunction

Please help!