Tacho help/wanted

[customFC]

Just looking for recommendations regarding Tacho's suitable for electronic ignition.
Want something in the 3 3/4? 80mm range and must look old school, not something that would be more at home listening to doof doof.
I see stuff on ebay and never know if it suits electronic ign.
So point me in the right direction, or perhaps you have something in the cupboard at home you want to part with.....HELP!!
PLMK
Regards
Alex

[customFC]

Zulu/Gary sent me a link that discussed converting mechanical tachos to electronic. This inturn led to a pdf file with step by step instructions and pics.
Here's the link.
http://www.britishcarforum.com/lore/attachment.php?id=12
Still looking though.
Regards
Alex