Gary, here is the other side of the engine. Back in the 60's the Trip's came with an automatic heater riser type choke. They had a little stamped steel shroud that attached to the LH exh man and a tube that ran up to the choke.
Now I fabricated my own manual choke set up using all Holley parts. Some people really get creative and do odd things. My favorite is using the choke backwards. So when your driving around the cable is pulled out. UGH! Why? Mine uses the stock cable and works the proper way. Though I have never needed the choke? Yet others go electric...not era correct, so I have to deny that idea. And others will get a really long cable and wrap it around the front of the engine.
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Here is a GREAT SITE and a heck of a nice guy, there is a great pic of a restored Tri Power with the temp sending unit on the first page:
http://www.gerlecreek.com/documents/tptechnical.htm
Retired USN Commander Brattland knows Tri Power! He helped me out a lot. And his book is a great investment. Worth 10x the cost.
The stock hood will clear the Tri Power as long as you don't have any spacer plates. Many people back in the 60's installed Moroso or other brands of spacers to isolate the heat from the carbs. I have found that driving around on the center carb heats up the fuel in the other two carbs, then when you get on it hard it runs poorly until fresh cool fuel gets into the front & rear bowls.
If I keep my Kar I will be spacing the carbs up. If i have to sell it this spring (currently unemployed and NOT looking promising), I will sell the Tri Power seperate and install the stock hood.
You will notice TWO temp senders in my pics. The one in the T/Stat housing goes to an electric SW temp gauge. So I have a sender pre & post T/Stat. I also have a mechanical Oil Press gauge. That is the black with red stripe hose you can see on the LH side. It looks old, but it's the Aeroquip super light hose. I choose it because it blends in under the hood.