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Message: <blockquote data-quote="MustangChris" data-source="post: 1036492" data-attributes="member: 10830">well, it will tell your if your stoich, but on a stock car with a stock tune, its safe to assume that.   Not worth the $250.00 guage in the least, ya know?Since you're stock(ish) Id suggest coolant and oil pressure for sure.fuel pressure is not really needed since you have a stock tune, stock fuel system, and stock fuel pressure regulator.the tach is a cool idea, tho.  be kinda fancy.  old-school dragster style... <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite7" alt=":p" title="Stick Out Tongue    :p" loading="lazy" data-shortname=":p" />if you want flashy lights and what not, a cheep way to go is a narrowband a/f ratio guage.  I sold mine for $5.00 + $5.00 shipping.... lol.  it says "Air fuel ratio" and has a bunch of flashy lights. ... . its litterally a $5.00 wow-factor. lol.  Its 99% useless....</blockquote>