[faapgar]

Ok you have a setup that obviously been played with to make it work.Micro switch and transducer are very important.Best transducer is the one for a 911T.Label is black & yellow and ends in 001 for the Bosch number.Jbell had one for sale here about a month ago.When you drive and close the throttle the microswitch tells the RPM Transducer to push the enrichment solenoid back to lean out the mixture.When you step back on the gas the rack enriches.You can keep your current setup as it will run pretty fair but you will shorten your new rebuild as under closed throttle excess fuel is being injected and washing your rings.The transducer prevents that.I had Porsche Fuel Injection school in 1971.I have always felt the Porsche engineers were smarter than I would ever be.Another plus is your mileage will improve for sure.Tough part is the re set up with the transducer working.On your idle circuit of the pump take the 8mm socket adjustment and turn clockwise one click at a time until it stops.Count the clicks and write it down.Then turn counter clockwise 24 clicks and stop.That is factory Bosch pre set within a click to either way.Then adjust main rack with the small screwdriver to get your CO% in range.Then your hard work will last.Fred