Hey everybody, can somebody accurately answer this question. I just bought an 87 4cyl automatic. It has an aftermarket digital dash that has got to go. I know Fieros had both 85 and 120 MPH speedometers in the cluster. I don't know which had what, and what years and models decided that. I'm assuming the 6 cyl. had the 120 speedo.
My question is this. Can I install the stock 120 unit in my 87 4cyl and have it run accurately ? For that matter , are all dash clusters inter-changeable?
Thx beforehand.....Bob

Yes.

What digital dash?

First dibs.

Its Toms Digital unit. See the post a few days back titled "test drove 88 Fiero- need advise please". Theres a photo on there someone posted. The " red " lighted unit is the exact one.

Should had 85mph speedo and everything bounces light at sides.
Speedo doesn't mater but many V6 had extra gauge pod over center AC and all back lighted and all have V6 tach

if they didn't cut or repin the plugs, find a 85-88 4 cyl set is likely far less work.
May have repin the plugs so need to check each wire goes to whatever pin Before you plug into an OE cluster. If 1 pin is in the wrong place can easily fry 1 part or the whole thing.

some notes you might find handy...
https://www.fiero.nl/forum/Forum2/HTML/138175.html

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Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)

The Ogre's Fiero Cave

Tom's digital gages use the stock connector pinout.