Did I find my tach wire?

Hey,

So unsatisfied as i am with tachless, i attempted to find my tach wire.  Today i found a harness on the driver side of my 1993 mitsubishi diamante ES (WHITE/ black w/silver dots i believe)... when i unplugged the harness, I got no reading on my tachometer/fuel gage/basically anything in the instrument panel... so i thought great, i must have found it in this harness..

However after probing some of the wires going into the harness (from the source) I found one WHITE/ black wire (tach on my car is supposedly white or WHITE/ blue at the coil) which showed me something like 25V AC, and when i'd rev my engine it'd drop to like 24... 23.. etc.  I put it on DC and it was reading 12v.. dropping to 11.. 10.. etc.  Not sure if this is the wire or not.  That was the only wire (if i remember correctly) that had fluxuation on that harness when i pressed on the gas. 

Anyway, I'd appreciate an input anyone has on this... thanks in advance!

-Derek

actually now that i look at my dm, i was measuring at 200 on AC as that is the only option my DM has.  So that would mean i was seeing around 2.6 VAC on that suspected tach wire at idle, and upon rev i was seeing 2.5...2.4...2.3... etc.

-Derek

Thats what I found...

tim

Well I technically did... although i didn't dig all the way up there, i found the harness that the instrument cluster uses for all of its electronics (tach/odometer/fuel gauge/engine temp/warning lights/etc.).  I pulled it out and they all didnt' work anymore.  I probed a white wire on that and saw it at 2.6 VAC while i was idle.  When I pushed down on the gas, the voltage dropped... then went back up when i released the gas pedal.  I was probing the wire with the red (+) lead and grounding the (-) lead to my chassis.

-Derek