Pusher speedometer 5mph at rest?
1998 Harney Pusher on Magnum chassis with CAT engine. I noticed that when it says I am going 60, others tell me I am going 55. Sitting idling it shows 5mph. Weird. Any ideas?
Forum Discussion
Some speedometers from that era actually had a stop-pin that stopped the needle from going down below 5 mph. Does it start to move immediately you move off or does it pick up at 5 mph? The 60 mph indication when you're actually only doing 55 could be influenced by the tire size difference.
I'd suggest doing a check at 10 mph increments to see if the "error" varies with speed, then do an occasional verification that it's consistent over time. It could be that either the speedo is a bit gummed up internally or there's some inconsistency at the engine transmitter end. 1998 electronics weren't the highly reliable ones we've come to expect nowadays - may even be analog rather than digital.
I'd suggest doing a check at 10 mph increments to see if the "error" varies with speed, then do an occasional verification that it's consistent over time. It could be that either the speedo is a bit gummed up internally or there's some inconsistency at the engine transmitter end. 1998 electronics weren't the highly reliable ones we've come to expect nowadays - may even be analog rather than digital.
