Quote:
Originally Posted by jay_bob
Just bear in mind the Diesel and gas tachs are different.
Diesel is 1 pulse/rev off the harmonic balancer pickup, gas is from the ignition and has however many pulses/rev based on your cylinder count.
If you try to use a gas tach on a Diesel it pins out at 7k as soon as you crank the engine. BTDT.
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Also be aware that the later diesels had a pickup on the flywheel housing and the tach amp was replaced by the EGR controller as the source of the feed to the tach itself. These had yet a different tach module.