The car's rpm guage will slam down to zero while driving, if you hit the gas it won't go anywhere it just makes like a bog sound. You have to turn the key to 1 accesory and then back to 2nd accesory and then it turns on again. It usually does it like 5 times and then stays on. Its not the enigne beacuase it was just replaced and did the same thing with the other one. Howeverthe first gauge clutster i had was stopping the car from going to its 7, ooo redline and when i swithed the gauge clutster out it fixed the problem so it might be something with that any ideas open to any suggestions thanks

 

are all your vacuum lines hooked up?