Convert 6 cyl tacho for use with 4 cyl

[black maj]

Hi peter

i encountered the same problem and dropped into the too hard basket...
however... i know for a fact you can buy generic el-cheapo tachos that can 
be used on 4 6 and 8 cyl cars....  so i'm guessing you could remove the 
electronics from one of these and use it??? or perhaps you could understand 
the circuit... next time i have my car here.. i'll scan the pcb for you... 
so you can work it out??? (was going to use the vn v6 tacho instrument 
cluster)

Ben



>From: Peter Gargano <peter at ntserver.techedge.com.au>
>Reply-To: gmecm at diy-efi.org
>To: gmecm at diy-efi.org
>Subject: Convert 6 cyl tacho for use with 4 cyl
>Date: Sun, 21 May 2000 18:06:59 +1000
>
>Two questions:
>
>1. What's the cheapest way to convert an analogue electronic tacho,
>set up for a 6 cylinder, so it reads correctly for a 4 cylinder.
>Assuming there is no access to the internal electronics, just the
>external signal from the coil. (logically, the tacho requires 3
>pulses for every two pulses the coil generates).
>
>2. What's the easiest way?
>
>Thanks in advance, Peter
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