I have a 1992 Honda Accord 80,000 miles. When I start the car first thing for the day, and start, when the rpm gets to around 3000 the gauge jumps all over. It goes up into the red and back down. The engine does not seem to be over reving or hesitating. After about 20 minutes running all returns to normal for the rest of the day. I have had the main relay and igniter replaced by the dealer. No change. Any ideas??

U siad the engine doesn't increase in rpms, only the gauge? Check the wires feeding the info to the gauge, sucha s rpm signal from distrib to ecu, ecu to the gauge and ground wires.

First, I would clean the connections going to the ignitor. Pay particular attention to the male and female connections going to the BLU wire, which "drives" the tachometer. I would apply a thin coat of dielectric grease to the ignitor's male connections. Ensure female connectors are tight--crimp with pliers, if necessary. Second, test/replace the tachometer. Third, I would replace the coil.

First, I would clean the connections going to the ignitor. Pay particular attention to the male and female connections going to the BLU wire, which "drives" the tachometer. I would apply a thin coat of dielectric grease to the ignitor's male connections. Ensure female connectors are tight--crimp with pliers, if necessary. Second, test/replace the tachometer. Third, I would replace the coil. Fourth, check for any vacuum hose leaks. Fifth, check the Fast Idle Thermo Valve. Sixth, check/clean the Idle Air Control Valve.

I have been having the same problem with my 95 accord The dealer has told me it's the ignition control module.

Here's how to change it yourself:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-46563-4.html#post265896

Consider replacing the coil and rotor at the same time, since you will have the distributor open.

I have a 1992 Honda Accord 80,000 miles. When I start the car first thing for the day, and start out, when the rpm gets to around 3000 the guage jumps all over. It goes up into the red and back down. The engine does not seem to be over reving or hesitating. After about 20 minutes running all returns to normal for the rest of the day. I have had the main relay and igniter replaced by the dealer. No change. Any ideas???

Here is the problem... Change your vacuum Control Box, IAC and intake manifold gasket... simple... just had my accord done