The sketch below shows the general configuration of the GRP under dash unit. It is roughly speaking a tray open at the back. The right hand side was originally open but I glassed on a side later. The original moded for the mould was made out of card glued together spray painted to seal it the filled and shaped with Polyfila, then repainted, rubbed down and painted again etc. as required to get a reasonable finish. This was treated with release agent (wax the polyvinyl alcohol the wax again) and laminated up to form the mould. The tray was then laminated in the mould with 2 layers of medium (450 gm) chopped strand mat. I should have used black gel coat to get a much more hard wearing finish than the spray paint I used!
The illumination for the switches is made from 3/8” thick black perspex. The hidden surface has a slot routed in it to allow strips of self adhesive LEDs to be fitted (Maplin N85CZ).
Left is the unit at an early stage of construction seen from the rear. The right hand side (left in this picture) has yet to be added.
Central locking receiver
Davies-Craig pump controller
Wiper delay switch
Door lock switch
Heater pump switch
Davies-Craig fault LED
Fuel pump interlock over-ride
Idle speed manual adjustment
Cold start auto/manual
For further details of the cold start system see here…
For further details of the alarm/indicator/central locking see here…