Yes, that’s mine, but I don’t think I’ll use it since it’s a 7K rpm tach and the motor is rated for 5K max. I’ll be using one of these: a 652B and 653B. They all take senders.
This is the 653B sender
I think a tach is a great asset for setting up your boat properly. If the motor is rated for max power at 4500rpm. then you can prop it to achieve 4500rpm at full throttle. The ones shown are all NOS. I have another one (not shown) that is a flush mount, which means drilling a large hole in the dash. I’m not sure I want to do that. I like the fact that the Airguides have that large "football" on the face to match vintage OMC gauges.
Verne
I don’t know if it’s ok for me to post this link or not but you can find out a lot more about them here:
http://forums.iboats.com/Marine-Electronics/Airguide