help...all my stock gauges are pegged and the tach stopped working

[BYRDPE]

Don't know wtf happened.I do have aftermarket gauges but I know something is wrong when the temp, alt and the tach stopped working at the same time. The oil pressure stopped working when I installed the op gauge years ago. Where do I start looking to fix this?
Thanks


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[jrichker]

Possible cause when all the gauges go off scale high is a bad or missing ground strap from the back of the engine to the fire wall.

 

[BYRDPE]

Possible cause when all the gauges go off scale high is a bad or missing ground strap from the back of the engine to the fire wall.

Thanks
The ground strap is there and not damaged. They were all working this morning.
Could it be something in the fuse box? I do have my aftermarket gauges wiring teeing off some of the stock gauges.