Remote start for 2003 Ford diesel

Yeah, you're not really going to find a tach wire on a diesel. The tachometer is run off of a crangle angle sensor and that doesn't really work with most remote starts. Plus, on the new vehicles, alot of that is done via the vehicle's data bus. The best way is to just use something that has a good current sensing circuit and some type of glow plug delay. Here's some info on a '02 truck but it should match up.

12volts	yellow & lt. grn/pur	+	ignition harness
Starter	green	+	ignition harness
Second Starter	none
Ignition	RED / lt. green	+	ignition harness
Second Ignition	none
Third Ignition	none
Accessory	gry/yel & RED / blk	+	ignition harness
Second Accessory	blue/lt. green	+	ignition harness
Keysense
Power Lock
Power Unlock
Lock Motor	pink/black		VSM
Unlock Motor	RED / orange		VSM
Parking Lights+	brown		headlight switch
Parking Lights-	none
Hazards
Turn Signal(L)
Turn Signal(R)
Reverse Light
Door Trigger	BLACK/ lt. blue	+	either kick panel
Dome Supervision	use door trigger
Trunk/Hatch Pin	none
Hood Pin	none
Trunk/Hatch Release	none
Power Sliding Door
Factory Alarm Arm
Factory Alarm Disarm
Disarm No Unlock	none
Tachometer			ignition coils
Wait to start
Brake Wire	lt. green	+	brake pedal switch
Parking Brake
Horn Trigger	blue	-	steering column or VSM
Memory Seat 1
Memory Seat 2
Memory Seat 3