How to convert aftermarket tach signal to work with OEM Tach ?

Mine has both pertronics pick ups in one distributor but still uses both coils and works exactly like the two distributor ignition. I just hook the tach pickup to either coil and it works fine.

Sent from my SM-G781U1 using FerrariChat.com mobile app

 

Nicks Forza Ferrari includes a tachometer signal converter in their Electromotive XDI kits for the 308, to have the XDI drive the stock tachometer. You could give Nick a call for details, see if their converter box would be appropriate for a Pertronix, and if they would sell the converter standalone from the XDI kit.

https://www.nicksforzaferrari.net/

Cheers,
Gordon

 

You might find something off the shelf that will work. I found this on google but there must be more. Anyone know the specs of the signal (the Pertronix website may say.)
https://electronics.stackexchange.com/questions/283411/how-to-halve-the-pulse-coming-from-a-three-wire-speed-sensor-on-a-remote-contro

 

I found this below on Eng-tips. There is a guy in Portugal selling a converter for £32 on eBay.

If you need exactly a divide-by-two, you could attempt to do a little circuit - RC filter into a transistor or comparator - and then into a flip-flop configured to divide-by-2 - and then into a transistor (level-shift) into your tach. However, this will take a little playing around, some basic electronic knowledge, and possibly a scope to do it.

 

i had to use a tach splitter and tach amplifier
Image Unavailable, Please Login

 

That’s a lot of kit for a relatively simple task.

 

it is, but it works, Using the holley coil packs and holley HP EFI with 4 borgo throttle bodies on my 78 Euro GTS