Hi Nick. The answer to this one is easy since I have the DeLorean workshop manual in front of me. Yes, as far as I've heard there was never any device made to attach to this plug to take a reading. Page M:03:01 Diagnostic Socket The Diagnostic Socket on the engine enables the following to be carried out direct with approved instruments- Checking H.T. circuit Duty cycle frequency valve Initial advance setting Checking the development of centrifugal and vacuum curves Measuring engine R.P.M. Wire Connections A Lambda Electronic Control Unit Orange. Frequency Valve Monitor B Feed Wire Purple. Battery Feed C T.D.C. Pick-Up on Cylinder Block D Earth. Yellow wire Terminal Allocation Wire Colour 1. T.D.C. Signal Pick-up RED 2. Diagnostic Socket Earth (ground) YELLOW 3. Lambda Electrical Control Unit BLACK 4. T.D.C. Signal Pick-Up WHITE 5. T.D.C. Pick-up Screening 6. Feed GREY Terminal number 1 starts at top row far left socket inside plug. Number 2 top middle. Number 3 top right. Number 4 second row far left. Number 5 second row middle. Number 6 second row far right. Plagiarized by yours truly. Many interesting items inside the DeLorean workshop manual. Including the torque specs. Control circuit diagrams. Brake bleeding procedure. Explanation of the heating and air conditioning. For example page M:07:01 "A defective relay is indicated by the failure of the unit it operates." Pretty simple. Mark R. Vanyo VIN # 02261 markman660{at}ncplus.net --- In dmcnews@xxxxxxxxxxxxxxx, nicholden@xxxx wrote: > > > Hi, what is the purpose of the sensor on the back of the engine that > reads off the fly wheel and goes up to the diagnostic plug? I am > stripping my engine of all unnessary parts at the moment as i now > have EFI fitted. Just wondering if i really need the diagnostic plug > now as i have a computer that i can read actual values off. > > Thanks Nick -sydney To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/