I was typing, if it was not different from the 91, I believe it comes from terminal 4 on the igniter. But I leave great amount of room to be completely wrong.
Yeh it comes from the igniter, an easy way to find a tach signal is to go to the diagnostic plug and it is marked up IG+ this is a tach signal, pull the loom back and locate the wire if you need to tap off it.
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