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As ECR handles more 90s and 110s that anyone else in the USA we wanted to share some common threads with you. The NAS Defenders are wonderful vehicles, but there are a few things you should know.
The Signal Conditioner: (1993 NAS 110 only)
The engine temperature gauge in your 1993 NAS Defender 110 is not telling you the truth. This is important because most Rover V8s will last a good long time, unless they develop coolant or overheating issues, so you need to know your coolant temperature and keep an eye on it. Behind the dash of every NAS Defender 110 is what is called a "signal conditioner" or "stabilizer." It is Land Rover part #AMR2401.
If you remove the dash panel, as shown above on an NAS 110, you will find it taped to the dash wiring harness. See the yellow arrow above.
Once you remove the tape holding the device to the harness you will find this piece, as shown by the yellow arrows above. What this little bundle of computer parts wrapped in electrical tape does is alter the signal coming from the temperature sender in the engine before it reaches the coolant gauge on the dash. Basically it tricks the signal to read lower on the gauge you see. It is wired in line between the sending unit in the engine and the gauge itself.
Here is a shot of the removed part with the electrical tape wrapping removed.
We have done tests with this device in place (that all NAS 110s have unless we have removed it) where we have purposely overheated the engine (Don't worry the engine was coming out anyway). During these test with the engine coolant temperature well over 230 degrees (well above normal and into the damage zone) the dash mounted gauge would still read normal. Even at over 250 degrees (death for a Rover V8) the dash gauge still reads only slightly normal. In fact under no conditions could we get the coolant temperature gauge to go into the red (or danger zone). The "stabilizer" prevents you from seeing your engines true engine temperature.
The ECR ROX solution to this problem:
In our customers NAS 110s (and we strongly suggest in your 110) we remove this device so that they can see the true engine temperatures. To remove the device is an easy unplugging of the unit. One wire is a little short to reconnect to the temp. gauge so a jumper wire is suggested, but not required (it will reach, it is just a stretch), but to complete the update you must also install a new temp. gauge in place of the factory 1993 NAS 110 gauge. This when combined with the "white" temp sender (part # PRC7918) that is found in most NAS Defender 110 engines will cure the problem and show you accurate coolant temp. information. This change duplicates exactly the later Defender 90 temp. gauge, a system that was designed without any signal conditioning.
We offer a complete set up to cure this in the NAS Defender 110. It consists of the correct gauge with factory appearance and the needed, color correct, jumper wires to make install a breeze.
$195.00 Currently out of stock
The wiring codes are:
Green wire: 12v power to the gauge
Light Green w/ Blue stripe: Wire from the sending unit to the gauge
Black wire: Ground (or earth)