03-29-2018, 01:08 PM
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CC Member
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Join Date: Feb 2012
Location: Keller,
TX
Cobra Make, Engine: Lonestar Classics LS427. Self-built 408W, AFR 195 heads, Performer RPM Intake, Quick Fuel 750, 407rwhp, 479rwtq
Posts: 549
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Not Ranked
Bouncy, inaccurate speedometer at speed
Tremec TKO 600. I think I'm using the electronic sensor, not the mechanical one but will have to verify it the next time I'm under the car. VDO speedometer gauge. I'm having a small problem with it.
At most speeds, it is accurate (adjustable). When I am coming to a stop (around <5 mph), the needle will jump up to about 30 mph for a second, then go to zero.
I've been living with this for years because it was mostly accurate. The other day, I may or may not have been traveling at triple digit speed (um, on the track, verified by gps) but the speedometer read 10 mph slow. At this speed, the needle was varying up and down by about 4 mph while the car was at a constant speed. When I slowed down to 70 it was accurate again.
I don't know if my problem is in the guage itself (doubtful), somewhere in the cable (also doubtful), or in the sender (possible).
Any thoughts on how to test which part of the system is bad?
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