AC Delco 3 port vacuum switch. 1/2"-14 NPT. Ships in AC Delco box. 

This is the only replacement available for the TCS transmission controlled vacuum spark advance.

Fits the following Oldsmobile vehicles:
442 1968-71
98/Ninety Eight 1968-80
Custom Cruiser 1971-80
Cutlass 1968-76
Cutlass Supreme 1968-72
Delmont 88 1968
Delta 88 1968-80
F85 1968-72
Omega 1973-76
Toronado 1968-80
Vista Cruiser 1968-74