New here, quick question on possible lean issue

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Hey all, new to the forums. Quick question, just got an 87 turbo, car runs great, no hesitation or stalling issues. Temp guage runs in the normal range (despite having been low on coolant when I got it). Car has minor mods, it does have an air/fuel guage, thing is it always reads all the way lean, but I think it is broken or possibly hooked up wrong, wouldn't the temps rise on the temp guage if it were at 16 to 1 or whatever it is. Is there another way to check for lean condition outside of running it to a shop. Also, where is the mixture guage typically hooked up to?
Thanks in advance.