My RPM gauge has slowly stopped working, it started by only going to about 3000 4000 and now it finally barely works, it barely goes up, car runs fine nothing wrong with it. but rpm's started to take a go a little bit ago and now its barely twitching. I wanna apologize if its been covered. I...

So im helping my boy start his 91 talon after its been sitting for 1 year, He just put a good used 14b on the car he plugged everything up and the car cranks but no start, he's got a new battery. So i went over there and i check for spark and there was spark, i took out teh spark plugs and they...