I have an 88 M-103, an 89 M-103, and a 93 M-119. I believe the M-119 would benefit from this mod as well and stated so at the end of last year in post #39 of this thread: E500 W124 performance mods
In that post I stated, in part: "Also have done the Jim F "Cool Harness" mod but that had zero effect on my better runs cuz you've got to be at 80 degrees C or less to get a good time and the Jim F mod doesn't kick the fans on till well after that temperature. I guess a guy could run a higher value resistor to get the fans to keep the temp at 80C but I would rather run a second resistor at the other temp sensor to fool the ECU and EZL into thinking it's 80C all the time so that they will allow full "Party Time" mode all the time."
I think even 80c may be too high. There may be more to be gained by going for 40c or 60c. So today I picked up three 4 pin temp sensors at the local U-pull-it and I'm going back to the track this Sat. Since the sensor is grounded through it's wires and not it's case, I can just plug in a "dummy" sensor, wrap it in a bag, and leave it on top of the eng. Since the business end won't be submerged in water, it will automatically read lower---just what we want. And the gauge will be telling me what temp. the sensor is telling the EZL and LH ECU. I can move the sensor around a little to fine tune the final temp. I will report here, at that other thread, and on a new thread the results. Regards, Eric