I have a 78 245 DL with an owner installed cruise control that cost\n119.95 in 1978 when it was installed. I repaired it when I purchased it\nfrom the original owner by replacing the original relay (whose coil had\nburned out) with a not exact but equivalent replacement. It worked\nseveral years after that, but has finally quit again.\n\nMy troubleshooting indicates that it is probably the totally analog\n"Speedostat" controller unit. This unit has an input and an output for a\nspeedometer cable to reference vehicle speed, and an input and output\nvacuum tube that goes to a vacuum servo. After all, the 78 Volvos had no\ncomputer controlled anything.\n\nI'm looking for a way to repair, but I fear that the speedostat unit is\nobsolete. I'm planning on a trip to some upick yards for a look-see. I\nthink that that part may also be used on other cars besides Volvos.\n\nI'd also like to consider a newer electronic unit, provided that it has\nsimilar signals to the analog unit, so I can use my existing turn signal\nstalk speed control switches and existing under the dash wiring. Since\nI have a manual transmission, I could get the vehicle speed sensing from\nthe tach (or ignition). I'll never use the speed control except in 4th\nor 4th with OD, so the clutch switch will kill the speed references\nbetween switches between OD in and out, as I always clutch with OD in or\nout.\n\nDoes anyone have any experiences with fixing or refitting cruise control\nto older Volvos before the electronic injection?