Hello, I just recently ditched the Stock FI system on my 1978 Datsun 280z and went over to Triple Weber's, with it I also upgraded to the 280zx distributor with the E12-80 ignition and upgraded the coil to the MSD Blaster Coil 2. Car started up like a dream considering they are brand new Weber's and haven't been tuned. However my Tachometer stopped working properly. Either it doesn't work  or it somewhat jumps around sporadically while driving. Am I missing something?