All A-pillar setups take either a 2 1/16" gauge or a 2 5/8" gauge. Your more common ones take the 2 1/16", and gauge companies that you will see in 9 out of 10 Turbo Buicks are either Autometer #1 or VDO #2. I have run Autometer gauges religiously for the past 14 years without any problems on my turbo cars. First gauge I ever purchased was an Autometer Sport Comp boost gauge for my 1990 Sunbird GT Turbo. I even buck the trend of the Import crowd and run an Autometer boost gauge in my Evo. I currently run the full pillar twin gauge pod from Lotek with Autometer Z-series 0-35 boost and electric oil press.