Quote:
Originally Posted by JJ 911SC
As per Bentley 240-12 (Fuel Injection)
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Sorry for a bit of miss information I gave on pin assignments, but the pic above is not true for all Carrera years!
I was looking at ACTUAL wiring diagrams in the Bentley, 970-30 '88-'89 DME does use
pins 4 and 11 for the tach. I just looked at it and assumed all years of DME were the same.(my bad to assume) Pg 970-26 shows the '84-'85 Carrera diagram, and indeed it uses pins #21 and # 11 to the tach. As the OP has an '85, pins 21 and 11 it is.
Obviously the '84-'87 DMEs are different than the '88-'89, at least for the tach signal.
Didn't know that, or is the Bentley possibly in error?