odometer rollback

[markdilljr]

I am putting a new gauge cluster in my 84 C-10 and I want the new odometer to read what the stock odometer was at. I am not trying to do anything illegal or get over on anyone I just want the new one to match what the truck has on it milage wise, Thank you to anyone that can help

[beastie_3]

I did the same thing, except with autometer gauges. go buy a speedo cable, cut it about 6 inches from the gauge. Cut the black cable housing shorter so that the actual cable is sticking out. Use a drill to spin the cable. You will be doing this for awhile.

Because I did this with autometer gauges and not stock, I dont know if you can access the back of the odometer and do something different.

[Captkaos]

I wouldnt worry about legalities on these trucks.  They are generally beyond their limits.  you should be able to rotate it with a drill, but pulling it apart and doing it is tricky.

[Da67goatman]

On that topic, does anyone know how to adjust the electronic odometer in 1989-91 suburbans?  I just changed drivetrains and gauge clusters and want to match the odometer new to old.

[Captkaos]

My 89 K5, 90 Burb and 91 Crew all have mechanical odo's

[zieg85]

My 89 K5, 90 Burb and 91 Crew all have mechanical odo's

Capt, did they offer a trip odometer in any of the mechanical speedometers?

[Da67goatman]

I got the gauges out of a 1991 GMC Suburban and it has electronic odometer, speedo and trip.

[Captkaos]

yes the trip meter was an option.

Da67goatman post a pic.  If it is electronic (I have never seen a 73-91 with it) there is no way to change it.

[zieg85]

Great, I need to find one then

[Da67goatman]

Here's the connection on the trans tailhousing, it goes right in place of the mechanical cable style.  The gauge end of the wires is part of the main plug-in connector that goes right into the cluster.

[jaredts]

This may sound silly, but can you turn the ignition to "on" without starting the engine and rotate the speed sensor with a drill and roll the miles that way?  Just a thought for the electronic speedo.

[Da67goatman]

Update: Here's the gauge end of the electronic speedometer.