Equipment
Starting wealth is $15,000. (Around $2500 in 1960s money but we'll stick to discussing it in GURPS$)
You can spend $3,000 of that on adventuring gear or liquid cash. The other $12,000 is lifestyle stuff - your car, your wardrobe, furnishings, home equity, etc... stuff that doesn't matter and won't help you out on an adventure.
Of that $12k you can set some aside as your stake in the business you and the other PCs maintain. The more you invest the worse your personal lifestyle BUT the more resources the business has, and the greater dividends you'll get at the end of the year.
TL is 7. Buy what you need to do your job. Starting year is 1961 so nothing produced after that point.