Listers, As a lot of you have efi engines in old cars, you may be able to help me.
I have just put an ecotec V6 im my VH commodore. It is running a VN computer with a programmable chip (VR base map at the moment), any way, since the conversion, the tacho does not work (it is a factory VH tacho). Originally the tacho ran off the coil, but now i believe that a pulse from the computer is supposed to do this. Can any one help?
 
How does a coil make the tacho work in an older car?
 
How does this happen in a computer pulse efi ?
 
    Wayne

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