SteveJ

One of the connections on the driver door switch I think is for the key in ignition buzzer. (Mine works at random intervals.) One of the wires goes across to the passenger side to complete the path to ground for the door light when passenger door is open.

Try reaching out to Z Therapy to see if that's a part they stock. I think it's part ZT154. https://ztherapy.com/products/masterprices/master_price_list.htm It looks like 72 nozzles are rare to unobtanium on the open market. MSA has 4 screw nozzles. Someone more knowledgeable than I am will have to advise more.

Yep, the headlight harness connections have been hacked off. *Sigh*

You lost me on that one. Is there a picture I should be looking at?

So in examining the 73 & 74 switch diagrams, the blue/yellow goes to switch position 3 on both. I'll look on the 73 dash harness to see where it goes at the intermittent relay, but I may need to be reminded.

Fair enough. We were all there at one time. Consider joining the Desert Z Association (http://www.desertzassociation.com/) and ask if someone could help you or recommend a shop. Another alternative is that maybe a member on here could help you or you could pay him to work on your car.

The turn signal switch changed between 73 and 74 when Nissan switched to separate bulbs for the brake lights and turn signals. The GB on #18 and the RB should go like this: See the diagram above. The RB and RW wires have to meet up with each other on the 3 pin connector. The third wire is for the horn. Wires from 3, 17, and 18 are all grounded. I don't have a photo available to show this. (That also goes to question 2.) It should be a single black wire from the turn signal switch to the headlight switch side. The white wire going to pin #14 on the switch is the power for the turn signals downstream from the turn signal flasher. Yes, the wires are reversed between the wiring harness and the switch. The yellow/blue wire from the 74 wiper controls goes to a yellow/blue in the 74 dash harness and over to the intermittent relay.

What is the timing at idle and at 3,000 RPM? Have you checked the valve lash?

There are a couple of people in the Atlanta area I would trust. If there's someone near you, @Patcon might know. I don't know if the Upstate Z Car Club still exists, but if they do, someone there may know, too.

D'oh! I missed the hint. You know I'll help. It's more a matter of scheduling than anything else.

You aren't giving us much in the way of details here.

That's not how the gauge works. As for an adapter, if you have a mechanical gauge with 1/8 NPT, you need an adapter like this: https://www.amazon.com/Dewhel-Female-Sensor-Adapter-Reducer/dp/B00V5Q6GME and a gauge like this: https://www.amazon.com/dp/B08HRPSJSB

Check with a mechanical gauge.

Or build your own... Right, @Matthew Abate?

I have used these without problems. As for the spades without crimpers, I'm sure you could find some if you searched more, such as this: https://www.amazon.com/PONFY-Connector-Assortment-Insulating-Electrical Vintage Connections has a lot of bullets, too, and I have plenty in my collection. Keep in mind that what you see at Cycle Terminal and Vintage Connections might have been produced at the same plant as the ones I linked from Amazon.

For the bullets: https://www.amazon.com/gp/product/B073GM7WST/ Rings: https://www.amazon.com/gp/product/B08QHZXZ3S Spade: https://www.amazon.com/gp/product/B07VKCCN12

If you want/need to replace the boots, here's a source: https://www.amazon.com/gp/product/B012T3YU2Y

Maybe mineral oil instead of mineral spirits.

The owner of the collection, Randy Jaffe, is a great guy to hang out with. Getting to turn wrenches on a Z and hang out with a great Z friend is a kick arse way to spend the day. The only thing that could have made it better is calling the wife to look for a part you need, and not only does she find it, she delivers it. Wait! That happened, too! That makes it a SUPER kick arse day!

Okay, it wasn't my Z, but I installed a fresh set of Z Therapy carbs on a 72 for a friend.

It doesn't have fingerprint or facial recognition...So I'm good there.

I know. I was considering coming up to visit you.

Do you think @Patcon placed this ad?

Did you go back to them and ask about it? From what I've heard from other people, they stand behind their product.

No problem. One thing I forgot to mention is that the gear ratios of the transmissions are in their respective FSMs. I'm working in the office today so I don't have ready access to my copies at the moment.