Quote:
Originally Posted by DarkAngel
sorry, i forgot to mention the year
it's a '90 ZR1
but i've checked the speed with a GPS and it seems pretty accurate
i don't have all the history of the car but it has been kept for a long time in a private collection ; it has really few milleage (17000miles) so i would be surprised that the gear ration would have been changed  |
I'll wager the "tach error" !
I have never used the C68 display to check for tach error but I would guess it could be done. Drive at a known display on the C68 and see what the tach displays. Will that work? I would think but I've never tried.
I believe you would do X 25 for the C68 display in 6 for RPM's. A C68 display of 80 would be 2000, 120 would be 3000, 160 would be 4000. I believe that's correct. I'd appreciate knowing.
Access is shown in the C68 section of the FSM but I believe you just depress fan up/down (same time) to access the display, fan up or down until you get to 6 and then press the "auto" button for the display of that parameter.