Tach wonky while warming up

[Uncle Mike]

The tach (an aftermarket item) on my '88 Civic jumps
all over the place while the car in warming up. Once the car is up to temp, tach reads OK. Should I be concerned?

thanks in advance.

"alot is not a word"
Uncle Mike

 

[Jim Yanik]

(Uncle Mike) wrote in

The tach (an aftermarket item) on my '88 Civic jumps
all over the place while the car in warming up. Once the car is up to temp, tach reads OK. Should I be concerned?

thanks in advance.

"alot is not a word"
Uncle Mike

Distributor problem??? (SWAG)