Thread: 91 ser trouble help please

ok so i got a 91 ser .problem is that when i swapped another sr motor (old 1 spun a bearing) the rpm and mph gauge dosent work. what could be the problem?? also another problem the light from the clock on the cluster and center console flickers quickly, why?? i have a little mechanic experience but also going to school to get certified, so still learning any help is appreciated. i also live in pennsylvania and right its snowing and i dont have a garage yet to work on it so please help

rpm and mph run off of the speed sensor on the trans. 91 should be the mechanical sensor where a cable runs from the back of the instrument cluster to the transmission right by the driver side axle.

The light is probably lose or just needs a new one. If you have the cluster out to fix the speedometer cable replace the bulbs.

Ok got you, to take off the cluster how long do you think that would take? Is there a how to on taking it off? Thanks for the help will save this thread do when it gets warmer I can remember where that cable runs off

'91s do have a cable-driven speedometer. The cable goes through the firewall from the speedometer to the speedometer pinion on the top of the transaxle. It can be a little tricky to see with everything installed in the car, but it's accessible. Sounds like you may have simply not reconnected the cable when you reinstalled everything.

dont take off the cluster just yet go outside and look at the trans and see if the cable is attached down there. cluster is just a couple screws

^^ What they said.

Plus, if your speedometer cable is broken (happened to me once on my '91), you can easily replace it without removing the gauge cluster at all.

Sweet sweet I did not expect all this help at all. Thanks for the diagram and very very helpful tips. For the speedometer cable I could just go to a advance auto parts and buy it if it is broken? Sweet to know the cluster is only a few screws for when I can replace the bulb so I can see at night lol. Hopefully I can take it to school soon and be able to check it out. Thanks everyone for the help