i installed a 3911 sport comp tach on my 82 and after about 6 months of working fine with no problems from either tach the sport comp starts reading only about half the rpm. then my factory tach started showing no reading. it comes and goes. sometimes they both work, sometimes its just one or the other, and sometimes neither works(the sport comp always reads something just not always correct). it really confused me since they are wired in two locations. (factory to dist. and s.c. to coil) i have looked for broken or loose wires and havent found any. its also embarrassing when people want to know why my $220 tach isnt working
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