ya i got one of those tach's also...mounted it on my dashboard (right hand side) just above the two air vents. Just drilled a hole...screwed in the mount and tightened the unit in place...didnt feel like drilling more holes for the wiring, so i just ran the wires behind the vent, i had the cluster and all out anyway...then ran the wires to the fusebox, found a nice how-to on here somewhere, and guess what? worked first time.
1) Red wire - power
On the main fusebox was a large connector harness with
multiple wires, there was a GREEN wire i spliced into
here, power works
2) Black wire - ground
Found a screw with another ground wire just behind the
hood switch handle, just tightened the wire in here
3) White wire - light
Underneath (behind) the light switch were two wires,
yellow and black, i spliced into the yellow wire, tach
lights up when i turn the lights on
4) Green wire - sensor
If you look under the steering wheel, on the LEFT behind
the light switch, you will see some "boxes" with
harnesses plugged in, there is a GREEN harness, find the
white/black wire and splice into it.
First try works great. The position wasnt really where i wanted it but it was hard to fit my drill in where i DID want it LOL...ah well, gonna add some more gauges too so its fine. I did upload pics to my profile, but hasnt been approved, heres a link to my pic on cardomain, keep in mind this is the first ADDON i have done myself...LOL.


Ken