Had another idea whilst compiling my order to VWP. I need to get a brake fail indicator. Now, the LED cluster I have can show red and green. I could wire it in such a way that it shows red for brake fail and green for oil pressure light (or in fact red for both). Not sure I fancy having green LED indications for something wrong though.
The battery condition monitor LED needs to be fitted separately so I suppose another single LED wouldn't hurt :-)
The horn button is another conundrum. There is no horn push in the middle of my steering wheel (although ISTR that there was one in the original car). I do, however have an unused stalk for the wipers. This has a push on the end which I could wire in to the horn.
Further electrical experiments have shown that the indicators and hazard circuits work! I thought I'd have a problem getting the hazards to work. They do flash about twice the frequency that they should do, but there are no lights connected at the moment. I should really get down to it and multimeter the wires and start connecting the lights up. That's possibly a job to start tomorrow.