Another OPS option
NAPA Oil Pressure Switch OP6065 (C$16) is a direct replacement and works fine. Advrider inmate tested and approved.
***Datchew's note: Make sure the one you get is not a tapered fit. A 66 vw uses a tapered fit oil pressure switch and that will not fit properly. Stephen says this one is not tapered. ***
(thx to StephenB)
Also Duralast PS158 just paid 7 bucks at auto zone.
(thx to TxDieHart)
Might want to add a Standard part number since it's a brand available at a lot of mom & pop part stores. I just installed one and it is perfect. Cost $15.00 Standard part number PS177