wiper switch/dash problem
Well maybe this will do it. I developed a similar problem when I replaced my coil about a month ago. I did not replace the radio supression condenser on the coil and it caused my wiper motor to stop after doing about 2 swipes and it also caused my tachometer to stop working. When I turned the wiper switch to off the wipers would go back down after about 2 minutes.
This sounds like a grounding problem. The wiper switch MUST be grounded, and it might be affecting the "other stuff."
Redfish and I have about 1.21 gigaposts on this
Generally, the biggest problem with dash clusters is.......
Poor ground. The cluster is grounded by the mounting screws. Install a dedicated ground wire from a screw on the cluster to a nut/ bolt on the dash frame or column support
Bad / broken PC board harness connector. Resolder, repair as necessary
Poor connections at the IVR socket, and bad IVR. Replace the IVR, and solder jumpers across the spring contacts to the board traces
Bad connections at the gauges. Loosen/ tighten the stud nuts several times, and or replace the fake nuts with real ones
Dirty PC board where the lamp sockets connect Clean the board
Weak/ dirty spring contacts in the sockets. Repair as necessary.