Hello, Working on a 1987 240, mileage unknown. Just replaced wireharness for the engine, engine computer and spark computer, swapped out the fuel rail and injecters, updated flame trapp to 88 and up. Now I want to tackle the speedo head and get that working, will the 1988 work in the 1987? I think it will but I need to eliminate the temp. compensation board and do some testing for the fuel sender and odometer motor, gear is good, have speed indicated. Does anybody (Art comes to mind) have a run through for the 240 speedo heads to trouble shoot all the circuits. I want to put the 88 in the 87 because it has the reminder for service, I removed the tach and installed the clock;it works, Tach didn't work, but the odometer doesn't work and the temp guage and fuel guage don't work, is it different in circuit wiring or do I just have a bum circuit board. Looking for some help. Thanks. Pauli