dRock's Tach FAQ


Pictures
Pictures



For Non-Marauder -05 panther owners, the ability to monitor engine RPMs is lacking with the factory instrumentation.

The following documents installation methods of a tachometer in ‘92-‘95, ‘96-‘97, ‘98-‘02 and 2003-2005 panthers (specifically, the CV/GM)
Note; an 03-04 MM or 06+ panther cluster w/ tachometer would require more extensive modification - this write-up is for installing an aftermarket tachometer.




Tachometer requirements:
There are many choices for your tach, and various sizes to choose from.
The Tach you purchase must be a non-diesel, electronic 8 cylinder compatible tachometer.

Note, most of the gauge pod offerings use a 2 1/16" gauge opening. VDO makes a very nice tachometer in this size that compliments the analog cluster nicely, it is part of their vision series. p/n: 333158


There are also digital tachs which would match a digi-dash cluster quite nice.
Search some on CVN’s Body/Interior forum for more pics and ideas.


Electrical hook-up:

Tach Signal:


92-95:
Pinout:


I would solder your tach signal wire to the EDIS terminal #2 wire, using heatshrink tubing over the joint.
From here the tach signal wire goes right to the tach, set it to 8 cylinders.


96-97: 96 CV PCM pinout:

(click for fullsize)

96 4.6 Stang pinout:

(click for fullsize)

Here is a picture of that pin, courtesy p71crownvic:


I drilled out the plug, and put a 12 gauge wire in the hole, long enough to reach the face of the connector. With the 12awg wire being so dense, there is no way the pin could not make great contact. I then adhered the wire to the connector, reattached the dust boot, put loom over my signal wire to make it look totally factory, and then re-connected the PCM harness/connector.
12 awg was a bit large, 18 awg is better as I did have to trim away a few strands to make it fit.

This tach source also requires an 8 cylinder tach setting


1998-2005



OR, I highly recommend you instead use the Red/Light Green striped wire at the main engine harness connector below the brake master cylinder. This wire is on Pin 34, which is right in one of the square connector's corners. You'll see it right away.
This location is easier to access and less likely to confuse with another wire (it's the only R/LG wire on the connector), however the splice will be clearly visible, if you are concerned.
Personally, after helping A LOT of people who mistakingly cut the wrong wire with the EEC diode tap method, I now highly recommend you wire the tach adapter to this location instead and save yourself any headache.

Here is a schematic of how the AM 9117 needs to be wired in the ignition system;
'98-'02;

'03-'04;


Wiring the tach adapter is simple!
Locate the engine harness connector located directly below your brake master cylinder. It is a large square connector;

(click for fullsize) (Image shown for '03-'05, '98-'02 similar)

The COP power feed is the RED/LIGHT GREEN stripe wire is on pin 34 of the main engine harness connector (c1026 03+) under the brake booster
Here is the pinout for reference purposes ('03-'04):

(click for fullsize)

The tach adapter is going to be wired INLINE of this Red/Light Green wire. Cut the wire as far back from the connector as possible so you have room to work with, unravel the harness tape/loom if needed.
Following the diagram above, wire the Tach Adapter's RED wire to the UPSTREAM side of the cut Red/Light Green factory wire. Upstream would be the outboard side, or closer to driver's fender
Wire the Tach Adapter's RED / GREEN wire to the DOWNSTREAM side of the cut Red/Light Green factory wire. The downstream side is the side leading to the engine.
The adapter's black wire goes to a ground point, and the GRAY wire to your tachometer
The adapter can be mounted to the fender liner, or wherever else desired. Acrylic foam exterior mounting tape will suffice if you do not want to mount it using the screw holes.

Remember! as mentioned above, the Red/Light Green wire MUST BE CUT. The tach adapter is being wired INLINE of the COP power feed, upstream of all coils. It's not being spliced *into* the circuit, and the tach adapter WILL NOT work if wired as such. The adapter must be upstream of all coils for a correct tach reading.

EEC diode wire tap instructions ('98-'02)

This picture, courtesy Embassy, shows this:

Image Courtesy Embassy

**The wire you see with the white splice connector is the incorrect wire, as Embassy found. The Wire with the two blue connectors is the correct one.
**Note: If you wire the tach adapter as show above and you do not have a tach signal - RECONNECT the Red/Light Green wire you cut and try the other one instead!!!! The position of the COP power wire is not the same for all years or even within the same year, it can be completely random.

EEC diode tap ('03-'05)


(click for fullsize)

The wiring color at the Diode output changed as well:

(click for fullsize)

Now the downstream of diode wire is DG/YE, but the upstream/12v input is still RD/LG. On the diagram above, you can see the feed that goes to the COPs, this is where you are cutting.

Given the revised location of the EEC diode, it's definitely more practical to tap inline of the main engine wiring harness connector at the brake booster - which is actually *much* easier to do.






Illumination:


Pinout of the rear defrost switches:


If you choose another switch than a rear defrost, just keep in mind orange with a black stripe is typically always illumination for 92+ panthers and is also true for the 01+ Trac or adjustable pedal switch wiring.


Tach power and ground:




Routing your wiring:



Tach location and mounting:

Depending on what size tachometer you choose, you can install your new tach in a variety of pods.






I hope this helps some of you guys get your tach installs done!

For 1995-2005 panther owners who find this all to confusing, a Scan Gauge will be best for you. It plugs right into the OBDII Data-Link-Connector (no batteries) and displays engine RPM among MANY many other readouts. It also computes MPG, trip computer, and is a OBDII trouble code reader/clearer
Check out www.scangauge.com

 


 

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Email me at dRock96Marquis@crownvic.net

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Page last updated: 3-01-2007