Going off the Ogre's cave I see it is suggested to purchase the EQUUS3641 Equus GM TBI Fuel Injection Adapter from Actron's home page. However, I cannot find that specific part number and when I look in the parts and accessories page I get two GM options for TBI adaptor of 7/16 or 1/2 (Part # 0180-000-1320 for 1/2" and 0180-000-1465 for 7/16". Are any of these two the correct one for a 86 duke?

Looks like the Actron part is no longer available...

There are a few on eBay right now.
http://www.ebay.com/itm/Gm-...191718205537&vxp=mtr

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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite.
"THE COLUSSUS"
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quote Originally posted by Gall757: Looks like the Actron part is no longer available...

Only ECM scanners.

OTC offers 0180-000-1465 adapter only. OTC 518487 thru many places.
Shows Only as part of a kit like 4480 and 6550 in quick search but page says Categories: Parts and Accessories
Google otc tbi adapter and many still has the part.

Equus Products is now Innova and stopped making the adapter

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Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)

The Ogre's Fiero Cave

[This message has been edited by theogre (edited 12-01-2015).]

So....the answer is 7/16"! according to the Ogre's page.

quote Originally posted by Gall757: So....the answer is 7/16"! according to the Ogre's page.

No clue. Never measured.

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Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)

The Ogre's Fiero Cave

To conclude for future reference, yes the 7/16 adapter is what is needed. It has changed part numbers and is labeled as 0180-000-1465
GM TBI Adapter 7/16 on the Actron website.

https://www.actron.com/content/gm-tbi-adapter-716

quote Originally posted by da.slyboy: To conclude for future reference, yes the 7/16 adapter is what is needed. It has changed part numbers and is labeled as 0180-000-1465 GM TBI Adapter 7/16 on the Actron website. https://www.actron.com/content/gm-tbi-adapter-716

can this be installed as a permanent fixture? maybe up by the TBI?

it's been done.

https://www.fiero.nl/forum/Forum2/HTML/127190.html