#1 It is really cold here right now and for the next few days. Yesterday my oil pressure gage would not read so i put on the manual gage and it shows good pressure. So after I take off it has started to work but over the last few days it does this everytime i start. SENDING UNIT?? any other ideas before I replace??

#2 Do the Centermatics Wheel Balancers work and are they worth the money? Would I still need to have my tires balanced? I am running mud terrain recaps and have been happy with them ready to purchase my 5th set but was wondering if the Centermatics would help out the wear and tear on my truck?