I believe there is a physical difference in the size of the ceramic material that the dimmer w/gauges has that also allows for a higher wattage capacity in the dim position.
I have seen replacements that the dimmer section is 2x the size of the 147 that I have.
The 67 console w/gauges and 4 spd. have 5 additional lights and w/auto trans. 7. For the dimmer to dim the additional lights you would have to increase the dimmer resistance to drop more of the voltage at the dimmer.
There are 4 dash,2 court. and 1 dome ( 2 deluxe) = 8 lamps so you would need probably 2X the resistance of the 147 sw.
My original 147 shows 0 to 7 ohms across the resistor, measured with a Fluke 83. I used the # 3 trem. and the wiper for my measurement. I also tried term #2 and term#3 and could only get 0 to 6.3 ohms.