shavedhead
New member
1999 Merc. 50, boat had no guages , I installed a sierra eclipse tach and a tach harness from my controls, hooked purple to +, gray to sig. and ran a wire from my ground bus to the- . Blk from harness will not test with meter so i assume it is not hooked up somewhere. the tach is set on 6p. went to lake today first time since install, and nothing, like not even hooked up. any ideas thanks for the help.