The gauge on my dak dash has no numbers. It looks like the one on this page; https://dodgeforum.com/forum/1st-gen...ml#post2266152

Anyway I just took my first long HWY speed drive in it, 105 miles round trip. It felt like the motor was wanting to shake or give up at around 65-69mph otherwise it was fine above or below that speed. The oil gauge was at the far right on or just before that first line after 20 miles. On the way back at around 65 miles the check engine light came on. When I got home it pulled a 32-EGR valve (it is 8 months old) and a 21-O2 sensor not changing readings remaining in center of range.

 

Is that pressure reading normal? Seems way high to me. The engine temp reading stayed dead center the whole time as it should.
I figure the EGR code came up because the O2 sensor failed and it was burning rich which would explain the poor MPG's. I've gotten it up to 14.5ish from 9 to 11.

 

OK
I changed the Oil Pressure sensor. It requires a special tool that cost me $7.67 It is a socket (around 27mm) with thin walls that fits over it. The pressure stayed in the normal range on the HWY and went down in town.
I put in a new NTK O2 sensor. It was a pain I ended up taping the wire tight to the body of the sensor with scotch tape then breaking that with needle nose after.
I cleaned the EGR which is only 8 months old.

I drove it 8 miles some on the Interstate the rest in slow traffic. When I got home I still have the two codes, 32-21. I recall that the EGR code when I bought it went away on its own.

 

Did you reset the computer?

 

I thought I had. Apparently I need to leave that battery disconnected for longer.
One thing I forgot to mention is the Check Engine light was not on when I drove it after the repairs even though it was still throwing the o2 code. That is one of the double asterisk codes which means the Check Engine light should always be on until it is fixed.
I'm thinking I actually disconnected the Neg battery when I did the EGR 8 months ago and did not when I did these repairs which would explain the code going away "on its own".

 

I disconnected the neg cable for 5 mins and the codes are gone.