115MPH to 145MPH
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Junior Member
Joined: Mar 2004
Posts: 54
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From: North Denver area
Car: 1989 Iroc-Z
Engine: 305 TPI
115MPH to 145MPH
I changed the speedo in my 89 Iroc-Z today. I bought a 145MPH cluster and swapped over the speedo, fuel and charge gauges. I didn't swap out the tach because mine has the oil gauge built in and the other one had the oil gauge riveted on the tach. Unfortunately I payed way too much for the 145 cluster for the condition it was in. I had to do the wire repair on the trip odometer that was suppsed to be in working condition. I also painted the black mask with aluminum paint as shown on another post here. I checked all bulbs and lubed the speedo cable before I put it back together. I successfully removed the odometer assembly from the 115 speedo and transplanted it into the 145 speedo. The replacement speedo shows the correct mileage of the car. 
Please don't make fun of my "road map" dashpad.
It will be replaced as soon as I can find one.
145 Speedo
Please don't make fun of my "road map" dashpad. It will be replaced as soon as I can find one.145 Speedo
Supreme Member
Joined: Nov 2001
Posts: 2,037
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From: Cypress, SoCali
Car: 2006 Tacoma X-Runner
Engine: 4.0L DOHC V6
Transmission: 6-Speed Manual
Axle/Gears: 3:15 LSD
Car is running a little hot and it looks like your battery is dead
Anyway it looks sweet, good job
Anyway it looks sweet, good job 
Joined: Aug 1999
Posts: 19,282
Likes: 103
From: Lawrence, KS
Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Nascar,
The plastic lens looks a bit cloudy. I've had great success in cleaning them up by using 3M Professional Formula Plastic Cleaner (for Clear and Colored Plastics), which I purchased at CarQuest. I used a drill, set at a fairly low speed, and a buffing attachment. Works great.
JamesC
The plastic lens looks a bit cloudy. I've had great success in cleaning them up by using 3M Professional Formula Plastic Cleaner (for Clear and Colored Plastics), which I purchased at CarQuest. I used a drill, set at a fairly low speed, and a buffing attachment. Works great.
JamesC
Thread Starter
Junior Member
Joined: Mar 2004
Posts: 54
Likes: 0
From: North Denver area
Car: 1989 Iroc-Z
Engine: 305 TPI
Originally posted by JamesC
Nascar,
The plastic lens looks a bit cloudy. I've had great success in cleaning them up by using 3M Professional Formula Plastic Cleaner (for Clear and Colored Plastics), which I purchased at CarQuest. I used a drill, set at a fairly low speed, and a buffing attachment. Works great.
JamesC
Nascar,
The plastic lens looks a bit cloudy. I've had great success in cleaning them up by using 3M Professional Formula Plastic Cleaner (for Clear and Colored Plastics), which I purchased at CarQuest. I used a drill, set at a fairly low speed, and a buffing attachment. Works great.
JamesC
trans87
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Joined: Jul 2002
Posts: 754
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From: South East MI
Car: 1992 Camaro RS AKA Big Nasty
Engine: Carbed '79 350 block, 360hp/380ftlbs (flywheel)
Transmission: 6speed from an unidentified 4th gen. ask me, ill tell you.
did you have to recalibrate anything when you switched from the 115 to the 145? I want to go for the same thing.
Joined: Aug 1999
Posts: 19,282
Likes: 103
From: Lawrence, KS
Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
The clusters are pretty much plug and play as long as you swap cable driven to cable driven and electronic to electronic--90-92 should be electronic.
JamesC
JamesC
Senior Member
Joined: Jul 2002
Posts: 754
Likes: 0
From: South East MI
Car: 1992 Camaro RS AKA Big Nasty
Engine: Carbed '79 350 block, 360hp/380ftlbs (flywheel)
Transmission: 6speed from an unidentified 4th gen. ask me, ill tell you.
Hrm, they didnt come any higher than 110 in the 90-92 years though did they?
Senior Member
Joined: Jul 2002
Posts: 754
Likes: 0
From: South East MI
Car: 1992 Camaro RS AKA Big Nasty
Engine: Carbed '79 350 block, 360hp/380ftlbs (flywheel)
Transmission: 6speed from an unidentified 4th gen. ask me, ill tell you.
in 90, didnt the irocs ave a 140 mph speedo?
Member
Joined: Jun 2002
Posts: 182
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From: Anoka MN
Car: 89' RS
Engine: 5.0
Transmission: slipping 700r4, soon probuilt
yah the 90 iroc did. im not sure if any of the othe 90 to 92s did though. there is actually one in the classifieds right now that porkyzilla is selling.
Supreme Member
iTrader: (5)
Joined: Dec 2001
Posts: 2,873
Likes: 5
From: East Tennessee
Car: 1992 Z28 Heritage Edition
Engine: L98
Transmission: T56
Axle/Gears: 3.23:1
Originally posted by Sunny RS
yah the 90 iroc did. im not sure if any of the othe 90 to 92s did though. there is actually one in the classifieds right now that porkyzilla is selling.
yah the 90 iroc did. im not sure if any of the othe 90 to 92s did though. there is actually one in the classifieds right now that porkyzilla is selling.
Supreme Member
Joined: Apr 2004
Posts: 1,002
Likes: 0
From: Boscobel, Wisconsin
Car: 1987 Iroc-Z
Engine: 355
Transmission: 700r4 w/ about 7500 miles on rebuild
personally, i want to get the 140mph speedo with Z/28 on the speedo. I saw one on eBay go for something like $75..looked great too.. but i didn't know anything about changing them out at the time and i didn't wanna screw it up.. oh well..
does anyone have any info on these? I heard somewhere (on here i think) that they were like a dealer option or used as a replacement by dealers or something.....
BTW, the speedo im talking about (the one i saw on ebay) the owner swore that it came from an 87 and was cable driven.
Rabbitt
does anyone have any info on these? I heard somewhere (on here i think) that they were like a dealer option or used as a replacement by dealers or something.....
BTW, the speedo im talking about (the one i saw on ebay) the owner swore that it came from an 87 and was cable driven.
Rabbitt
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