85 e30 318i Need some help De-Ricing and Tuning my 1st Bimmer..

First and foremost, I appreciate the info that I've obtained here in the past, and appreciate any help with solving my current issues. I picked up an 85 318i M10 177xxx miles, and solid, this spring, and have been amazed at how much work it Needed...wow....but things are coming along pretty good, no major issues...yet. I'm having a Cold Starting issue, also my temp gauge does not work? Related? Planning on pulling temp sensor, and cleaning along with the ICV, hopefully not replacing. My temp gauge twitches when key is on and that is all it does, never moves. I checked, and cleaned the temp gauge's prongs in the cluster when I replaced the speedo gears, which leads to my next Q. My Odometer still will not work, speedo works fine tho. I also noticed my tach recently, seems like it isn't keeping up with RPM's after 4-5xxxrpm's? It seems to be reading less than it should, this happened before I pulled the cluster, so ruling out me damaging the Tach, I hope...any help is appreciated, Thanks Chris

85 e30 318i Need some help De-Ricing and Tuning my 1st Bimmer..