Trying to install a Defi Bf Tach. There are two different wires for tach signal input on the tach depending on the voltage reading of the oem tach wire will determine which wire you use.

Unfortunately i don't have my meter/o-scope on me. Does any one which one of the two blue wires (Lt blue or blue) to use? or if you know what voltage readings on the oem tach wire that would be helpful also.

- Here is a copy of the instructions, info on both blue wires can be found on the first page.
http://www.nippon-seiki.co.jp/defish...nual-e0804.pdf

Once again thanks in Advance