[scooterbob]

:crazy: Tach gone crazy on me this morning. Fired up the car and ran it down the freeway about my normal 85-90 Mph and the tach was reading (5000) higher than normal. It was about 1000 rpm off from what it should be. All of a sudden it would jump back to normal and then do it again several times randomly. I am aware that I should check grounds and fuses for loose connections, but what else? Is there any type of common problem that causes this otherwise? This is the first time it's done it, so I'm curious where else to start. Any suggestions are welcome. Thanks!

 

[Zen31ZR]

Some kind of electrical spiking, probably the alternator. I notice you have a grounding kit, I wonder if it may not be the problem. Grounding kits can send ground paths in directions never intended by the vehicle manufacturer, it can affect ECU performance......

 

[scooterbob]

Some kind of electrical spiking, probably the alternator. I notice you have a grounding kit, I wonder if it may not be the problem. Grounding kits can send ground paths in directions never intended by the vehicle manufacturer, it can affect ECU performance......

I originally thought of that too, but my grounding kit is nothing more than replacing the stock wires with new ones and adding one to the alternator. Plus I've had the grounds on there for some time now and never noticed anything. But........I will disconnect them this evening if I notice the same problem when I go home, and see what happens.
Any other ideas?