I bought the car with a Comptech supercharger, an AFR gauge, plus these two. One of them is for boost, but what's the other one?
Do I need these on a supercharged car?
Aaaaand... do these suggest the car had a turbo before?

Thanks!

 

looks like boost and exhaust temperature to me. You don't "need" them, but are good to have to monitor the engine.

 

Looks correct. Those gauges are not great at monitoring the engine though, AFR and Oil Temp would much more useful guages.

 

Replace the exhaust temp one with an oil pressure gauge. the OEM idiot light comes on far too late to save anything. It's a must when boosted, in my opinion. Also, get an AFR gauge like spaded said.

 

At first glance I thought these were the same gauge and had to take time to read the text on them. Would be the same problem in the car on the road requiring too much attention.

Uniform gauges look great just sitting there but are less than practical when driving especially when displaying niche information. It's kool to see the boost but not necessary. The S2000 dash display tach and speedo can't be confused even with microsecond glances but the fuel and coolant temperature gauges are not so good. Starting on a couple hundred mile trip I noted I only had a quarter tank of gas and stopped for gas. Took 3 gallons. Yep, I was looking at the temperature gauge. Back in the Brit sports car discrete round gauge days I rotated them all so straight up was normal and could note any abnormalities instantly.

-- Chuck

 

Heck, I’d keep them. Retro looking and exhaust temps are cool to know. But oil temp and oil pressure would be the ones to go with if you can. You don’t really need them though if you have an aftermarket ECU with properly configured protection settings.

 

I think EGT gauges were more popular years ago before widebands became very common and cheap (around the early 2000's). Now you don't see many folks running EGT gauges as a wideband tells you more. They are still useful (too much timing retard/running lean will cause higher EGT's) but a wideband is more useful. Those old school greddy gauges are cool. My favorite are/were the amber lit peak/hold aesthetically. I used to have them on my old integra.