Thanks for the photo, that's another option. That looks nice too!
It's not really another option... Factory tach is a rare option to begin with, and even more rare (see: extremely rare) after 81 or so. If you are lucky to find one in a junkyard, (and you will need to be extremely lucky) chances are it's busted, and repairing that is going to cost you - maybe not $215 (price of gm sports salvage) but consider the time and inconvenience of hoping/wishing you'll find a factory tach, and one that works. Plus, you'll then have to figure out what to do with the fuel gauge - either get that full cluster from junkyard, then do some splicing to hook up to your 86 harness... or wiring in just the small fuel gauge (but will your cluster/faceplate bezel (black thing) accept it?)... etc. etc. you'll still have to splice in power and ground for the gauge since your cluster is not wired for it.
This aftermarket tach fits right into existing holes and draws power/ground from fuel gauge, while adding a small fuel gauge below. Very easy, very convenient, stock-looking.
Yes, it is expensive, but if you want a stock/factory look, the gm sports salvage option is the way to go.
Side note: I'm sure they're making a good amount off these tachs, since it is literally a printed sticker with tach and fuel hash marks that they just slapped on a plastic (not metal) tach gauge. (But don't let that fool you, it still looks great as you can see from the earlier post)
Did mine recently, it turned out great:
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