hey guys on my gauge cluster the rpm guage isnt working good. anyway to fix this?

 

Depending on the year, check the connection on (-) at the coil leading sold for older 7's , the newer ones check the (-) on the trailing side coil

trailing is indicative of the blue boots over the the electrical posts.

 

thanks mike its an 83

 

You could have a bad trailing ignitor

 

how do i fix that?

 

Pretty easily, the ignitors screw on to the outside of the distributor. Remove the screw, pull straight out on the ignitor to disconnect the electrical connection, push another one into place and screw it down. The factory uses some white heat-sinking compound on the ignitor, but I don't generally reapply it, and I've never had a problem because of it. Try connecting the tach send wire to the other coil's (-)terminal and see what happens with your tach. Don't worry, you won't screw anything up, but that WILL tell you if it's the ignitor, or the tach itself. Good luck! -WG

 

I was just taking the easy free stuff out of the picture first.. Lets just hope its a connection problem. Could be a faulty tachometer itself, do you have a timing gun. If its a bad trailing igniter, the trailing plugs wont fire.. If its working sometimes and then not others, it could be the igniter, but lets hope its just a connection..

BTW: Anyone know if the 83 uses trailing as the trigger for the tach? I beleive only a 79 used leading for tach, I know the 80 used that funky box... So 81 up was trailing trigger?

 

hey i got a problem... i just did a dash pull and put in the new S/R Motorsport guages... My RPM guage is now way off... What can be wrong?? thanks, Rotary-Rex

 

83 does indeed use trailing ignitor for the tach.