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I don't know much about the Tech 1. I'm sure they are good but most of the diagnostic information you will need are already built into your Reatta's onboard diagnostic system. There is a lot of information about using it in the menu at the top of the page. Feel free to ask if you have questions.

Ronnie, you did by no means sound like that. I believe there was no "standardization" of auto diagnostics across the auto industry until the Feds mandated it with OBDII.

I have never used one. Since the Tech 1a is for GM vehicles specifically, it may have some features not included in other scanners. I have an Auto XRay that will connect and function but it cannot deliver more information than already available in the onboard system. The only advantage is it can do limited recordings for review, where the onboard system can only do a snapshot. It can't hurt to have one.

Way up (and I mean way up!) under the left side of the dashboard is the theft deterrent module. It has a 20amp in-line fuse...pull the fuse to disable the system. This will stop the system from horn beeping and lights flashing if there is an intrusion. Additionally, under the hood is a relay center. Relay "B" is for the horns. You can swap out one of the other relays to test if the "B" relay is any good i.e., horn now works. I'm referring all this from memory, so for what it's worth go for it.

https://reattaowner.com/roj/guides/209-electrical-system/62-other-electrical/223-alarm-system-how-to-disable

The diagnostic port in all Reattas is ALDL (assembly line data link) and is unique to GM computer cars, 1981-1995. I have an OTC 2000 with a pathfinder III cartridge and GM cable that works well but for mustiple displays you need a Windows device, TunerPro RT ssoftware and a ALDL to USB adapter.

You most likely already know this, but the Reattas were pre-OBD1. The onboard diagnostics via the HVAC is quite useful.

Ronnie, I received the Service manual today. While reading through it, I saw where it was mentioned. Just was wondering if it was worthwhile to try and find one. Part of my joy with this hobby is digging up stuff for these older cars. But! This 91 will be my youngest collector car. Have 2 62 Skylarks, a 78 Rolls-Royce Silver Shadow II, a 41 Cadillac and a38 Cadillac. All of them are road ready. Jim

I have gotten similar info from Barney Eaton. He was even able to tell me where my Reatta was originally shipped to. He would also like to add your car info to the data base. Contact Barney on barneyeaton1@gmail.com

Thanks Ronnie, it is still down.

There is a website, reatta.net, that I believe has that information but it has been down for a while. When it gets back up it may have the info you are looking for.

I googled it and Wickapedia had the numbers. 1214 Coupes 305 Convertibles 1519 Total

To this day, I can't ignore the urge to have my arm extended out the driver's side window...............kind of like a dog sticking his head out the window while the car is in motion.

Dredging now but think California cars had to run leaner and with less advance than the other 48/