89-91 Suburban speedometer - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Wgesnerjr** · 04-02-2018, 06:55 AM

I have just about finished up my swap of a 2004 tahoe 5.3/4L60E into our 85 Chevy truck. I decided to use an 89-91 cluster to get the electric speedometer and not have to change the trans to cable Speedo drive. I did have the PCM reflashed by Brandon at LT1SWAP.COM and let him know which speedometer I would be running.
However, took my first drive this past Saturday and found the Speedo is not working. I would like to check my wiring before I declair this the speedometer is bad.
I know the Suburban cluster has 3 leads (power, ground, input) for speed and the PCM has 2 leads. Can anyone tell me how they wired theirs?
Thanks in advance

04-02-2018, 06:55 AM	#1
Wgesnerjr Senior Member Join Date: Jun 2015 Location: Atlanta, GA. Posts: 737	89-91 Suburban speedometer I have just about finished up my swap of a 2004 tahoe 5.3/4L60E into our 85 Chevy truck. I decided to use an 89-91 cluster to get the electric speedometer and not have to change the trans to cable Speedo drive. I did have the PCM reflashed by Brandon at LT1SWAP.COM and let him know which speedometer I would be running. However, took my first drive this past Saturday and found the Speedo is not working. I would like to check my wiring before I declair this the speedometer is bad. I know the Suburban cluster has 3 leads (power, ground, input) for speed and the PCM has 2 leads. Can anyone tell me how they wired theirs? Thanks in advance __________________ Jay Gesner Atlanta, GA 1985 C10 Long Bed 4X2 LS 5.3, 4L60E Father/Daughter Project

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