hey guys,

got myself a monster tach on my 87 iroc...now..thing is i didnt install it so i have no clue...my buddy did and hes outta town for a bit..

it started to go a lil squirrelly last night and stays at about 7000rpm no matter what...

now..i took the dash off and noticed that the black wire(ground i presume) isnt attatched...no prob i can ground that..

but what i need to know for now and for future knowledge..

where do i hook up the other 3 colour of wires... i know one has to go to a power source(for the lighting of the tach) and one has to go to the coil for the rpms...but which is which and how do i wire them up??

if anyone has a diagram that would be great...

thanks a bunch
iroc2nv