I am restoring a 68 1800s, chassis no. 28034. It was in horrible condition but after much welding and body restoration it's starting to come together. The problem I am having is with the dash layout ( switches, etc). This car seems to have more dash components than it has holes. It has a hazard switch and a separate dash light dimming switch as opposed to one built into the light switch. After installing all these I don't have room for an overdrive indicator light or an emergency brake indicator light or an overdrive switch. Since it was all apart when I got it I have no reference as to how it was laid out originally. On the left of the steering wheel I have wiper switch, choke, headlight switch and hazard switch. On the right I have panel light dimmer, ignition and fan switch. This seems to line up good with the wiring harness. There is room on the right to punch one more hole if needed. Since I don't have an overdrive switch, I am not sure if I am missing a toggle switch that mounts in the dash or if the stem switch mounted on the right side of the steering column can also be used for an overdrive switch as well as extra horn. The car did not come to me with the "loud horn", so I don't know if it ever had one. I think in my spare parts drawers I may have a headlight switch with the built in panel light dimmer, so I might possibly be able to free up one hole. Then I could put the overdrive indicator light in the first hole on the right, next to the steering column. Then I would need to find where the overdrive switch goes and where the emergency brake indicator lamp goes. It seems that the dash configuration has changed a lot from year to year, so it's hard to find a diagram of my specific car. Under the dash on both sides there are only two holes. They hold the overhead light switch and air vent on left and the map light switch and vent on the right side.