When AC is turned on spedo and tach go crazy please help

[Slam32]

This problem started yesterday. When I turned the AC on the spedometer and the tach started jumping up and down. As I drove the car faster they jumped even more and I was going about 45mph and the spedo read 100mph. When I turned the Ac off everything retured back to normal. Also the ABS INOP light came on. But it goes off when the car is restarted. Anyone have any ideas as the what the problem is? thanks

[97chevycamaro]

Sounds to me like you need a old priest and a young priest, The power of christ also.