Wiring up a light to the OEM I/C pump is pretty easy, just add one of those little things that slides over the fuse blades (#13) that has a male spade connector. Insert the fuse back in & run a wire from the spade inside the car then find somewhere under the dash for a ground. That's what I done before I built the aux. circuit to get the pump to come on when I turn the HE fans on. When I done what's posted in this thread the car was on my trailer sitting in the garage. I already had the HE temp gauge & fan light wire's ran into the car, when I done them I had the whole bottom of the dash out and they were tie-wrapped up to things. But when I ran the wire for the pump light I just threaded it into the firewall with the rest of the wires and just dropped the dash low enough to fish the wire to the temp gauge. I figured the wire would just lay on the bottom of the dash with no problems, WRONG. I pulled the car off the trailer Wed. and when I went to put the car back in the garage I was turning the steering wheel then I felt some resistance then it went away . I kind of had an idea what happened, I turned on the fans and had no pump light. Talk about luck, when I fished the I/C pump light wire in, the wire went right through the "U" joint yoke of the steering shaft. If a person was tring to do that, it would never happen. I dropped the whole dash out yesterday and re-ran the wire with the rest of them with tie-wraps like I should have done in the first place.