3 replies to this topic

[LukeH]

I'm thinking of changing my mpi to centre speedo as I already have a bespoke carbon fibre binnacle I had made. I don't want to retain the standard tachometer and would like to fit something retro looking. The problem is the mpi is wasted spark so I can't fit a normal electronic tach.

I googled around and found this diagram on another forum. Would it work allowing me to modify a tach to work with the mpi coil pack?

Edited by LukeH, 22 October 2014 - 06:09 AM.

[Guess-Works.com]

What you need is a retro looking tacho which is designed to be connected to an ecu.

[LukeH]

What you need is a retro looking tacho which is designed to be connected to an ecu.

 

I'm finding that this is easier said than done unless I am looking in the wrong places. 

 

Would the theory above still work though giving me another option?

[LukeH]

A quick update 

I have purchased a Smiths tach on eBay that will suit the look of my car but it is for a 4 cylinder positive earth and obviously not suitable for my car but neither would a neg earth unit without modification. 

I am going to be building the circuit found on this website LINK that will replace the circuit board in the tach allowing any configuration of input i.e. -ve from coil or ECU and it can be calibrated to suit my needs. 

I could have purchased a ready made conversion board for about £43 but that would be the easy route and I wanted to learn as much as solve the problem. I know that I haven't designed my own circuit but building one based on someone else's design will still be satisfying for me (if it works!) 

I will report back with how I get on in case anyone finds this post and wants to know for their own project. 

Luke.