/en/qa/tag/compustar-cm800-datalink Powered by Question2Answer /en/qa/60203/2014-grand-caravan-t-harness I installed a 2014 grand caravan with evo all T harness and compustar cm 800. after programming, I can lock and unlock. but I tried many times to learn tach but failed. I changed seting from tachless to tach in starter brain. connection I made are +12v parkling light and ground. ignition and +12v connected in harness according &nbsp;to the diagram. D2D mode. &nbsp;the light was correct when programming.<br /> <br /> I read cm800 install manual again. it says it support idata protocol. is that the means that &nbsp;cm800 doesn&#039;t support fortin 2 way d2d mode? it can tell evo all of door lock and unlock. but doesn&#039;t read foot brake and tach stauts? Dodge /en/qa/60203/2014-grand-caravan-t-harness Sat, 17 Oct 2015 21:17:16 +0000