Dash
Layout to determine where the SVA exempt area is (outer circle), which is 127mm beyond the edge of the Sierra wheel that I will be using for the SVA test with the inner circle being a 280mm diameter steering wheel. In the end I ordered a 290mm steering wheel to allow clear visibility of the shift-lights.
The finished article
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All the switches I chose are waterproof with rubber booted toggle switches along the bottom row controlling: Hazard, Fan, Fog, Lights on/off, Indicators with the main/dip switch on the right-hand side. In the middle is an FIA compatible battery isolator / battery cutoff switch, then ignition switch and finally the mandatory big red starter button. Along the top row are momentory switches for dash buttons 1 to 4 plus the horn. There is now also a 9-way D-type connector on the right-hand side of the dash tucked under the screen (rather than in the middle as shown in the schematic) for downloading the data logs from the dash.
The instrumentation unit itself is an ETB Instruments Digidash. This unit is manufactured by two enterprising fellows I know through the Yahoo bike-engined-car list and the 750MC roadgoing bike engined car racing series. In a nutshell the unit is a highly functional set of instrumentation comprising, in my instance, oil temp and pressure, water temp, speed, revs with 7 stage shiftlight, fuel level, odometer, voltage with all the SVA required warning lights/telltales and a lap timer and even data logging. All in all a bloody fantastic bit of kit and very inexpensive. Needless to say that I had one from the first batch of these. My particular unit has a bespoke carbon fibre front panel to complete the minimalist look of the car.