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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: oldfieldcycles on August 01, 2013, 09:58:42 AM

Title: TGPI and aftermarket speedo
Post by: oldfieldcycles on August 01, 2013, 09:58:42 AM

i have been working on installing an aftermarket speedometer which is an Acewell unit. i also built RBM's circuit board http://www.motobrick.com/index.php/topic,1452.msg20543.html#msg20543 (http://www.motobrick.com/index.php/topic,1452.msg20543.html#msg20543) to give me a gear position indicator and the ability to start in neutral. i have the speedo all hooked up and its working fine, but installing the gear indicator has been a problem. i thought there was an issue with the circuit board, but after getting testing help from RBM, the circuit is working as it should. it turns out that there is some issue with the TGPI which was working fine with the oem speedometer and i have not driven in the rain since installing the new speedo. i tested the leads conductivity(at both the instrument wiring harness and the connection on the right side of the tank for the TGPI switch) in neutral and in first and second and the wires are not conducting way they should. im getting no conductivity in neutral, when in 1st gear its like im in 3rd and 2nd i guess it would be 6th if the bike had 6th(the LED display shows 6 when in 2nd)
considering the TGPI switch was working before removing the removal of the OEM cluster, is there a chance there is some other issue? looking at the wiring diagram for the bike i see no other connections between the switch and the wiring harness at the cluster. could i have shorted the wire or blown up the tgpi? seems too robust for that.

Title: Re: TGPI and aftermarket speedo
Post by: gavthirtyseven on August 02, 2013, 07:21:58 PM

I'm looking to fit a simple tachometer from the auto parts store and junk all the original dash. I may keep the original connection block and use the standard clocks as a basic diagnostic unit from time to time. I don't really mind about having a gear display but what is the deal for starting the bike without it? Clutch have to be pulled in I guess?
 Can I bypass the sender unit somehow so I can start it without having to pull in the clutch?

Title: Re: TGPI and aftermarket speedo
Post by: oldfieldcycles on August 03, 2013, 07:38:24 AM

i believe you can run power to the starter lead, but i think then your neutral light would always be illuminated