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The Pin-on type push button were arrived in the middle of the 70’s. They were removed from the market when a new valve (behind the dash) came in. It depend on the manufacturer but they disappear around 1985 for International, around 1990 for Kenworth and Peterbilt, around 2000 for Mack, and Volvo kept them to around 2005.
To make them we need to know the diameter from the shaft that goes out of the dash, they need to measure both truck and trailer.
You need to be aware that if a truck got 2 or 3 knobs they can be 2 or 3 different size. So you can also park 3 truck of the same make and the same year side to side and they can have all different size knobs.
The shaft can be 3 different size 1/4, 5/16, or 3/8.
The display is free and will be send with your forst order.
* You have to put approximately 6 weeks for the reception.