hi there i have just purchased a EL Gli its currently getting some work done for a roadworthy but got some questions i would like to do some modifications...

How do i go about adding the low coolant sensor ?

The Low Coolant Sensor is integrated in to the Plastic coolant Bottle, and ya get them cheap from the wreckers, but can be added to an existing coolant bottle.
The part you will require is 10K888-AA, the low coolant level sensor.
This part simply screws in to the existing Coolant Overflow Bottle, but you will need to remove the blanking plug first.
Once this part has been fitted, you will then need to wire it up to the Instrument cluster
One wire is Black, and is connected directly to ground.
The other wire colour, Yellow/Red, should be connected directly to the Instrument Cluster, low coolant lamp, On the Right Hand Side connector, Pin Number 3.
Finally, you will need to add the Low coolant sensor Bulb to the Instrument Cluster.
This Bulb is located right next to the LCD Panel, on the Right Hand Side (With the Back of the Instrument Cluster facing towards you). The socket for this bulb may be blanked out by a round paper sticker, simply remove this sticker, and fit a new Bulb and Bulb Holder.

sounds easy enough

i also have a dash clock to go in ive done the dash clock mod on a ef gli are the wires there in a el gli as well ? also will a fairmont/futura interior light wire straight in ?

also will the rear courtesy light plug straight in ?