This is a correct pulse delay wiper setup for 78-80 trucks as indicated with the “washer wipe” font on the face of switch-not reproduced and no longer available new from GM. Will also work in 81-83 trucks as well. Very hard to find set and this has been bench tested for performance and the OE capacitors on the circuit board have been replaced with modern Panasonic caps with the same voltage and ohm ratings. Very nice part!! Perfect for your restoration!