All Honda models (1992-2001 OBD1/2A/2B) that have the proprietary 3 pin or 5 pin DLC diagnostics connector are fully compatible and supported.

Yes, it does work with some of them, for more details on this topic please read the post Aftermarket / chipped ECU.

Yes you can, the profiles do not affect the functionality of communication with the ECU, they only provide values to increase accuracy of calculations for fuel consumption, selected gear, engine revs etc. You can edit the available profiles to make your own custom profile.

You can find the information here.

You can read about features of Hondash here.

Connect the DLC connector to Hondash Interface. The LED will start flashing. Open the Hondash app and follow instructions to pair Hondash interface. More information on pairing here. Additionally you may configure custom car profile for more accurate readings, more info here.

DLC connector can be found in various locations described on DLC Interface.

Try to change the rev interpretation method in Settings / Car / Ecu. There are 3 possible methods to calculate engine rev value, depending on the car's Ecu, usually OBD2A method 0, OBD1 method 1 (e.g. Ecu P28 requires method 1 to display engine rpm correctly).

Some OBD1 cars ('92-'95) don't have the power wire in the DLC connector. In this case you have to wire the interface as described here.

No, you can leave it connected. However if you're not going to drive for a longer period it's highly recommended to disconnect the interface to prevent possible car battery drain, when you power the interface directly from DLC port, which is hot at all times.
For permanent installation it's recommended to use an ignition switched power source to power up the interface.

In this case please use the Android Bluetooth manager. Search for a new device with name "HONDASH" or "OBD", the pairing pin is 1234, after pairing go to Hondash app "Settings / Bluetooth Interface" and make sure the "OBD" or "HONDASH" is selected under "Hondash Interface". If you're unable to discover the interface, try to use another Android device. You can even use any bluetooth equipped non-android device to test if you can discover the interface with it. Some devices have issues communicating with each other for unknown reasons. More information on pairing here.

Please follow this guide on Fuel consumption calibration.

Currently no, but the app will receive an update to support it in Q4 2018.

Compatibility with standard ISO 16 pin OBD2 ECUs will be incorporated using ELM327 interface in Q4 2018.

Hondash UID is a Unique Identification number of bluetooth interface. One of the purposes of this number is to identify the Hondash in device list thus avoiding using other devices with identical name. It doesn't restrict the user in any way. You can use your Hondash bluetooth interface and Hondash app with multiple devices at the same time, on any compatible vehicle.

No, the support is being considered.