Dear Miss Jeep Gal,
Do you have a digital voltmeter?
You can get one at Harbor Freight for about $5 or get one at a auto parts store for maybe up to $20.00.
Very helpful for testing so that we can pin it down and not just sling expensive parts at it, useful later on too!
Did you just install the tachometer?
Unless it is not wired in right, it should have nothing to do with spark.
I have had six CJ-5's and a Willys, still have the last 1977 CJ-5 (Mr. Jeep) and the 1946 Willys (Willy).
I can make you "Jeep" again if you will do the tests and report back with results.
I do have diagrams and pics that may help!
I know what it is like to have a sick Jeep, I am sure yours is probably just a mild cold.
Images (Click to enlarge)
Monday, October 31st, 2016 AT 3:22 PM