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I see that the windshield washer on my 74' uses air from the spare tire. i looked at the washer reservoir and noticed that the tube from the tank to the spare tire was missing. Also the remaining section of tube from the tank split. Does anyone have the cap and tube to make my windshield washer usable, or know where I can get them - Thanks

I just finished installing a washer pump in my Ghia, which had the same type "spare air" system as my 914. It starts by putting a small switch on the wiper switch, replacing the (usually leaking) water valve on the rear of the switch. I did the surgery about 20 years ago on the Ghia switch, but buried the car under 914 parts back then. I also modified my 914 switch at that time, because I went with one of those space saving spares that need to be inflated before you can use it in my car. I seem to remember it was in the steering column with the turn signal switch. So not an easy mod. But well documented here https://www.pelicanparts.com/techarticl ... washer.htm
Anyway after you have a switch, you need a relay to power the pump and wiring from the switch to the relay, power wire to the relay, and wires to the pump. mine works like a modern car now. I also seem to remember there was a 944 switch that had the electrical contacts already in it rather than the water valve.

That said, I've seen those parts for sale new @ CIP: https://www2.cip1.com/ProductDetails.as ... %2D979%2DB for example. You'd need to find a longer hose for a 914, but a FLAPS should be able to get that for you, along with the pump and relay if you decide to go that route. The switch I used looks like this one: https://anchor-electronics.com/product/ ... msps-103c/
I threaded the back of the original washer valve so it could thread in and spent an inordinate amount of time getting the length of the pushbutton just right after getting rid of the wider top portion (black button on the above example switch).

I have yet to find a used original tank valve that still works, so if you want it to work getting a new on is the way to go, unless someone can explain how to fix the valve. Not only does it allow air from the spare to pressurize the tank, it also needs to stop letting air out of the spare before it goes below the pressure needed to drive on. So two failure modes, no pressure at all or all the pressure in your spare...

The only sane way to "fix" the valve is run a drill bit through it as a vent and rig up a proper electric washer pump/

It's been ages since I last did it but from memory converting the in column valve to a microswitch was pretty trivial on both my 914 and squareback.
I want to say I used a mk1 switch which was a direct swap, but on one of them I used a std issue microswitch brand microswitch i had laying around.

Yup, drilled and done. Works pretty good, now I just need to hear what it sounds like on the road. The pump I used is LOUD! At least from in front with the hood open.