1990 convertible tach not working
 

okay tach was working before I put in the new transmission so I put in the new transmission now the tach not working it does work for a second right when you start it up but then it stops any help on this is much appreciate

Same thing was happening to my vert not to long a go, but it was cuz of the bad top and almost having full 1in of water on the passenger side floor board and that flooded the ECU. Got a new ECU and keeping a car cover on it and she has been doing fine. Sorry that dont help you much haha but hope you get it working soon

Check to see that you have trailing fire.