by Karl von Salzen
[refers to 1979 bus engines in US according to Federal or California emissions standards]
Look at the left end of your gas tank panel. How many relays do you have?
1 = California
2 = Federal
You can also pull out your FI ECU and look at the # on it:
039 906 021D Cal Standard trans
039 906 021E Cal Auto trans
039 906 021B Fed Standard trans
039 906 021C Fed Auto trans
You can look at the # on the cover of the AFM:
0280 200 022 Cal
0280 200 020 Fed
