Just saying Hi.

Hey people, I am new to the forum, so I wanted to introduce myself. I have been truck driver in USA for about 3 years and for about 7 years in Europe and Asia, which bring us to the total of 10 years Since I moved to USA (3 years ago), I have been OO. I own Volvo 2007 with Cummins ISX cm870 engine. In the beginning I have had a lot of problems, but mostly thanks to you guys, I fix it and brought it in a very good condition. When I say thanks to you guys, I mean on all the info that you share here, which helped me a lot in the past 3 years. 90% of the time I fix my truck. I am not sure why I didn’t sign up until right now, but better ever then never. I live in Chicago as of right now, and I have plans to move to the western states sometimes soon. I promise that I will be very active member on this forum, since I respect truck drivers very much and I can’t live without the truck For the end I will ask one question: For a longer period I am having problem with my rpm arrow, It doesn’t move down toward 0 smoothly, it goes like Seconds arrow on the watch, skiping (jumping) from line to line. In the same time, first 5gears are not getting enough of power, and than 6and up are absolutely normal. I will replace speed sensor this weekend, but I am not sure if will change. If someone had experience with this, please advise me. Thank you very much and stay safe out there brothers and sisters. Cheers!