Any information will be appreciated.
I have a 1980 (early) F100 351C, however I think it originally had a six cylinder, when I bought it the tacho was not working and was marked on the back for 6 cyl, and have since removed it, re-calibrated it for 8 cyl and bench tested it successfully, however it still did not work when returned to the dash.
I have spoken to a VDO sales guy who informed me that because I have an electronic ignition system (after market) the original tach will not work and needs modification.
If you have experienced this problem and/or completed the modifications, your information will be very much appreciated. I really don't want install an after market gauge.
regards,
Stevo