Having read this entire thread, I still have a question. (My tach has stopped working, after working intermittently for a year or so.)

A: First post said to splice white (20) to grn/blk (25). (and plug back in??)

B: Later post says to jumper 20&25 as well as 16 &14 (and presumably tape up and leave unplugged)

I have no EGR, A/C doesn't work, 85 Turbo. What is the difference and which is preferable.

Or could this be OVP or it's fuse? I read that fuse is up under passenger dash. Is there a relay there as well. If I jumper the wire to tach, are the fuse and OVP required? (I obviously need to read up on this stuff )

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Graham
85 300D,72 350SL, 98 E320, Outback 2.5