Hi
The rev counter on my 911SC is playing up. It works ok for 10 miles or so, then shows either nil revs or very high revs. I have checked the wiring as far as I can and thought it might be the wiring from the CDI unit, which I think sends pulses to the rev conter/tachometer, but the plug into the CDI unit seems v firmly in. It seems unlikely to be the 12v power supply wire (from the ignition switch and/or oil pressure gauge) or the wire to the rev limiter. I had similar problem 5 years ago and had the instrument rebuilt by Speedy Cables (who say they are VDO specialists) but maybe it needs doing again. Unless anyone has other ideas, I will send it to JDO Instruments this time
The rev counter on my 911SC is playing up. It works ok for 10 miles or so, then shows either nil revs or very high revs. I have checked the wiring as far as I can and thought it might be the wiring from the CDI unit, which I think sends pulses to the rev conter/tachometer, but the plug into the CDI unit seems v firmly in. It seems unlikely to be the 12v power supply wire (from the ignition switch and/or oil pressure gauge) or the wire to the rev limiter. I had similar problem 5 years ago and had the instrument rebuilt by Speedy Cables (who say they are VDO specialists) but maybe it needs doing again. Unless anyone has other ideas, I will send it to JDO Instruments this time
