Like the other poster indicates, use the correct version, though a 1989 Volvo 240 may have Bosch 2.4 or 3.1 with manual transmission, I *beleieve*, so the speedo and dash head cable pinout at the dash head rear can be very different even within the 1989 model year.

If you have exhaustive wiring diagrams and also search here on the bb, you may have found your answer with the speedo, though the speedo replacement action in a dash head, or entire dash head replacement, can cause problem.

http://www.volvowiringdiagrams.com/

The Blue Bentley Volvo 240 Bible is best.

My 1990 with Bosch 2.4 Jetronic has a 9800 speedo, as Uncle BlueRidge indicates on his 1989 240.

With the speedo issue resolved, and I hope you can soonest, you only have wear item and consumables replacement. As you owned the car since new, you have the service history.

Then you have to diagnose what your 1989 Volvo 240 wagon with M47 II (I think 1987-88 had the M47 II and newer) manual transmission requires.

At 240k miles, you should be on a second set of suspension bushings and all joints, if these are OEM (www.tascaparts.com) parts. You have rear wheel bearings that could probably use some new NLGI 2 grease packed in there, and maybe the front. Fluids Coolant, brake fluid every two years. Your M47 II uses a filled for life filled at th factory Volvo gear oil for this special manual transmission. Do NOT use TYPE F fluid as the owner and Volvo literature suggests in that M47 II transmission. Use the Redline MTL version the website suggests. See the instructions for M47 II overfill. Rubber parts like suspenspion bushings, the low pressure fuel return line from the gas tank forward and the immersed fuel line between the in-tank fuel pre-pump and the fuel sender unit, all require replacement (use newer low pressure fuel line that resist petrol and ethanol). How are the tailgate hinges and wire harness through the (right or left?) hinge? The hinge pins can pull through the roof mounted hing plate, require replacement by as many miles as you have on your 240. The tail gate sags and the bottom lip of the tail gate may drag or chafe on the bottom door sill.

White lithium grease all around the body, hinges, door locks, a good quality oil, like mobile 1 15W50 is good for the locks and keeps them free moving all frozen winter.

There exists a host of matters you can treat. The various 740 (see FAQ link at the top of any BB page) and what passes as a Volvo 240 FAQ can be helpful with wear items on crticial systems.

There's more. While logged into the BB (I'm not currently), check out the post histories like Uncle Art's and others for insight into these and other matters.

As for parts, go either with Volvo OEM, and in PA-state you have www.tasca.com in Baltormors, so you have a day or two UPS ground or USPS priority. Or, go for the OEM part, like instead of a replacement alternator brushes from Volvo, get the Bosch bradn brushes for your Bosch brand alternator, or buy a rebuilt or replacement alternator as new.

Questions and comments?

cheers,

Hope That Helps.
--
Grumpy Cat is a LOL cat meme.